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Bulletproof Coffee Review - 23 Things You Need to Know

Bulletproof Coffee is a newer diet and lifestyle concept that seems to be gaining popularity. Proponents claim increased mental clarity and weight loss. However, with almost no clinical research to back up their claims, we were skeptical.

We asked our research team to find out more. They looked into the ingredient list, potential side effects, and user reviews. We also tried to find any relevant clinical studies to back up their claims. We then took that information and condensed it, presenting you with the bottom line on Bulletproof Coffee.

Bulletproof Coffee can be purchased through their Official Site.

Bulletproof Coffee Readers: Noom is offering our readers a risk-free trial, for a limited time. Click here for more information!

What is Bulletproof Coffee?

To start, Bulletproof Coffee contains grass-fed butter and different forms of MCT oil. Dave Asprey, a biohacker and author of the Bulletproof Diet, invented this drink. Ingredients include:

  • Coffee
  • Grass-fed butter
  • Brain octane oil (Concentrated coconut oil and palm kernels)

According to Asprey, the quality of these ingredients is what makes Bulletproof Coffee special.

Dave created his version of butter coffee after returning from a trip to Tibet. He aimed to lose weight without over-exercising and found that it helped him shed pounds and gave him other health benefits, like improved mental clarity.

However, he’s not the one who invented butter coffee. Butter coffee and tea have been around for centuries, especially in countries like Vietnam, Nepal, Ethiopia, and other parts of Asia.

According to Dave Asprey, there are other types of bulletproof coffees, but you’ll only get the same health benefits if you use his coffee beans and his version of the MCT oil.

Does It Work?



Bulletproof Coffee Competitors

Bulletproof Coffee
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Company Information

Bulletproof Coffee – Company Information

Like all coffee lovers, Dave Asprey enjoyed drinking coffee since he was a young man. He said it made him feel good, but he’d crash after drinking it. This pattern continued to the point where he stopped drinking coffee for five years.

Asprey said: “Until I realized it wasn’t the coffee. It was the toxins that form during the production of mass-marketing coffee.”

He “re-engineered” the coffee process to create Bulletproof Coffee, which he says he makes with “ultra-clean” beans.

Mixing butter and brain octane oil into the coffee is something he came up with when he weighed 300 pounds and was struggling to lose weight.

Bulletproof Coffee and Dave Asprey

Bulletproof Coffee came about when creator Dave Asprey began to gather a wealth of data about himself. This included sleep patterns, responses to certain foods, or how little exercise was needed to improve his health. He used his own money to find out as much about his health and body as possible.

Much like everyday Americans, Asprey tried different types of supplements based on research. He then created supplements that study, and his personal experience showed to be effective. He calls this biohacking or using the genes you were given to create the best possible version of you.

Bulletproof Coffee came about when he was given yak-butter tea traveling in Nepal. It is a staple there for energy, especially in the cold winters and high altitudes. He experimented on himself to create a version using one of America’s most popular beverages: coffee.

The Story Behind Bulletproof Coffee

Bulletproof Coffee BPC came about when creator Dave Asprey found himself out of energy during a high altitude trek in Tibet’s mountains in 2004. He found his way to a guesthouse where a native handed him a cup of yak-butter tea. He found an instant energy-booster and acted like a neuro-stimulant to clear his mind and thinking. He discovered that the natives use this nutrient and calorie-dense drink to make up the calorie expenditure when living in such harsh conditions.

He studied why these effects occurred and decided to create a more accessible version for the public using ubiquitous coffee and grass-fed butter. MCT oil was added after realizing that it would add calories from fat that would not be stored in the body, and thus people could use Bulletproof Coffee to lose weight.

David Asprey has also written several books detailing his foray into health products, most of which he discovered by analyzing data on himself.

Super Brain (2018)

Game Changers: What Leaders, Innovators, and Mavericks Do to Win at Life (2018)

After interviewing with many successful people in business, health, and life, Asprey put together some of the advice and patterns he noticed in those who have changed the way many things are done in the world.

Head Strong: The Bulletproof Plan to Activate Untapped Brain Energy to Work Smarter and Think Faster in Just Two Weeks (2017)

This book outlines how to use your brain to its fullest capacity by being intentional about what you eat, how you exercise, and how to manage your day to be more effective.

Bulletproof: The Cookbook: Lose Up to a Pound a Day, Increase Your Energy, and End Food Cravings for Good (2015)

This book continues where the original Bulletproof Diet left off with recommendations for how to enjoy a diet that encourages vegetables, meats, and fat-based coffee, or Bulletproof Coffee. It includes more recipes to keep you from being bored with the restrictive diet.

The Bulletproof Diet: Lose Up to a Pound a Day, Reclaim Your Energy and Focus and Upgrade Your Life (2014)

This book covers the background behind the founding of the Bulletproof Coffee Diet. David Asprey began to experiment on himself to find what would help him become healthier than on his carb-heavy typical American diet. These are his findings and personal anecdotes on why the BP Bulletproof diet can improve your life.

Upgraded Chef: 12 Core Recipes to Supercharge Your Body & Brain (2012)

This book includes recipes that can be the basis for starting the Bulletproof Coffee Diet. It is limited in recipes, but mostly because the diet is based on serving recommendations of approved foods and the Bullet Coffee that is the basis for the diet.

Super Human: The Bulletproof Plan to Age Backward and Maybe Even Live Forever

This book discusses anti-aging techniques. According to David Asprey, there are ways to reverse aging, increase energy, and improve the body’s ability to heal on the “sub-cellular level.”

Bulletproof Coffee Customer Testimonials

Bulletproof Coffee Ingredients

Asprey claims that his Bulletproof Coffee is with toxin-free beans that are much better than all the other beans. He says that brain octane oil is 18 times stronger than coconut oil because he makes it with C8 (caprylic acid) MCT oil.  It’s triple-distilled and only comes from coconut oil, unlike other MCT oils from palm oil.

He also points out that most companies producing MCT oil use solvents and bleach to clean and deodorize their oils, but Brain Octane only uses earthen clay.


Coffee is a drink that we make from roasted coffee beans. Coffee allegedly contains a variety of benefits, including weight loss and cardiovascular support.

Coffee generally has some essential nutrients like B vitamins, potassium, and manganese. Coffee also acts as an antioxidant, maintaining mental clarity.

The BMJ published a report saying “coffee consumption seems generally safe within usual levels of intake, with summary estimates indicating largest risk reduction for various health outcomes at three to four cups a day, and more likely to benefit health than harm,” but goes on to say that, “Robust randomized controlled trials are needed to understand whether the observed associations are causal.”

We’ll touch on this a bit later on, but right now, we don’t see much in terms of solid evidence backing coffee as a “cognitive enhancer.”

Coconut Oil

We produce coconut oil by pressing the fat out of the white meat inside the coconut.

Coconut is high in calories. “You can’t just add it to your diet without cutting back elsewhere and expect to lose weight…” It goes on to talk about coconut oil’s ability to enhance cognitive function, pointing out that there is no reliable research backing this claim.


Nutrition Reviews discusses the effects of coconut oil on cardiovascular risks, writing, “there was no evidence that coconut oil acted consistently different from other saturated fats in terms of its effects on blood lipids and lipoproteins. Given the limited number of intervention studies in this area, along with the methodological flaws evident in existing studies, further well-designed randomized trials that include appropriate controls, are adequately powered, and examine a range of CVD risk factors are required.”

Other Bulletproof Coffee Ingredients

Medium-Chain Triglycerides

MCT is short for medium-chain triglycerides, which are fatty acids found in foods and used by the body for energy. Medium-chain means it is made of between 6-11 carbon atoms per chain, making it easier for the body to break down and process instead of a long chain of 12 or more carbon atoms found in most high carbohydrate foods. They also do not require other enzymes in your body to be broken down and absorbed, such as insulin.

MCTs are found in tropical oils such as coconut oil and palm kernel oil. Most of what you see on the shelf will be derived from coconut oil since there are issues with humane and sustainable sourcing regarding palm kernel oil.

There are three main components, depending on the number of carbon atoms. C6, C8, and C10 are the most common, known as caproic acid, caprylic acid, and capric acid. C8 makes up the majority of the MCT oil at about 12% and has anti-microbial properties that can help maintain a healthy digestive tract.

It works to keep out bacteria that may be harmful and maintain a balance with the good bacteria already present in the intestinal tract. C6 and C8 are also the most efficient fatty acids for your body to turn into ketones for energy, but C6 can cause an intestinal upset that leads to bouts of diarrhea, especially in those already susceptible to food sensitivities. C10 is just a bit slower but still an efficient source for the liver to create ketones.

Since MCT’s are not usually found in the everyday foods of the American diet, the body can have a reaction when they are introduced. Common side effects include gas, bloating, and diarrhea. When adding the oil, such as with a ketogenic diet or to supplement fat-digesting enzymes, it is best to ” start small with the MCT oil, which used to be given to hospital patients lacking enzymes to digest fat. It can wreck your digestive tract,” Mr. Mullen said in an interview in the New York Times regarding the use of the oil in a Bulletproof type of coffee.

There are no long-term studies to confirm that MCT oil causes damage to the digestive system that we located. However, Epilepsia reports that there can be side effects if care is not taken when introducing it into your diet. This is due to the easily digested C6 chain.

As if Bulletproof Coffee didn’t already tout enough benefits, you can add other supplements to increase its effect. These can be added directly to the coffee or are good to take before or after drinking it because of the fat-soluble properties.


L-theanine is a naturally occurring amino acid found in tea.

One study published in Nutritional Neuroscience has shown that it has a perceived effect on concentration and energy, especially when paired with caffeine. Participants taking the l-theanine had a greater recall and were less distracted when asked to complete mental tasks than those on the placebo. Adding it to your coffee would likely improve that energy boost most people get from their morning caffeine does already. It is recommended to consume about 200mg with eight ounces of Bulletproof coffee.

Bacopa Monnieri

According to The Journal of Alternative and Complementary Medicine, a herb used in traditional Indian medicine improves memory function. It is fat-soluble and is thought to work best with a fat source available, such as would be found when adding grass-fed butter and MCT oil to your Bulletproof Coffee.


According to Drugs in Aging, this substance is a type of racetam, which work with brain chemistry in the creation of acetylcholine, an important neurotransmitter involved with memory formation and attention.

It is fat-soluble, making it an ideal supplement with Bulletproof Coffee instead of traditional meals. The recommended dosage is 750 mg, with eight ounces of Bulletproof Coffee.

Coenzyme Q10 (CoQ10)

According to Nutrition, this supplement has long been used for heart health due to its antioxidant properties. This can prevent certain diseases by protecting against substances in the environment that cause cell damage.

It requires fat for best effectiveness, so taking with your Bulletproof Coffee seems two-fold for your body: good fats and heart protection all at the same time. About 90 mg with eight ounces of Bulletproof Coffee is the daily recommendation.


How to Make Bulletproof Coffee

This is how you make your very own cup of Bulletproof Coffee, according to the official website:

  • One cup (8-12 ounces) of freshly brewed coffee made with Bulletproof coffee beans.
  • One teaspoon to two tablespoons of Brain Octane oil.
  • One to two tablespoons of grass-fed, unsalted butter or grass-fed ghee.

Adding Flavor to Bulletproof Coffee

Since one of the product’s main complaints is on taste, we felt it necessary to talk a bit about adding flavor to your cup of joe.

Bulletproof Coffee says that it already has a “creamy, buttery taste” and that it doesn’t really need anything else, but here are a few choices to add more flavor – in case you find yourself cringing:

  • One to two tsp heavy cream
  • Organic cacao powder if you want a bit of chocolate taste
  • A pinch of cinnamon and nutmeg powder
  • Low carb sweeteners that don’t have a terrible aftertaste.

Enjoy your Bulletproof Coffee with homemade fat bombs or low-carb desserts. It is not recommended if or when you’re intermittently fasting.

What is the French Press Method?

A French press is a coffee brewer that does not use a paper filter like traditional drip brewers. The paper is used to remove oils that can be harmful in high amounts. However, those oils are also part of coffee’s flavor, and removing them changes how the coffee tastes.

You add hot water directly to the coffee grounds to let it brew, then use a press to release the coffee into your cup, leaving the grounds behind.

A French press allows you to brew coffee with all its natural oils and nutrients. You can also let the coffee brew longer and release even more caffeine and natural ingredients.

Does Coffee Quality Matter With Bulletproof Coffee?

According to Dave Asprey, you’re regular off the shelf coffee may be contaminated with mycotoxins, the by-product of mold and fungi which can propagate on wet coffee beans. Procedures are in place to ensure that consumer coffee blends are free of mycotoxins and stringent protocols keep coffee safe to be used.

However, many believe that all coffee is not created equal, and many companies may not have the same kind of stringent quality standards needed to produce a flavorful coffee. Name brand Bulletproof coffee is single-origin from South America and follows quality standards to minimize contamination from mold or fungi. The high-quality Arabica beans are one of the most popular beans for any coffee. Arabica is recommended for a low incidence of mold forming on the bean during processing.

Grass-fed butter is another point of quality when using the Bulletproof Coffee recipe. Grass-fed butter is full of vitamins, minerals, and antioxidants that are beneficial to the body. Regular butter doesn’t have the same amounts as you would find in butter made from animals with a grass-based diet.

Bullet Coffee also requires the use of MCT oil. This does not necessarily have to be the Bulletproof MCT oil, but it is different from using just coconut oil in the coffee. Coconut oil doesn’t have the same level of MCTs. MCT oil is concentrated medium-chain triglycerides and is used by the body to create ketones. They are not stored as fat when they are found in excess. Dave Asprey’s MCT oil has a combination of the most efficient of the fatty acids. It removes a lot of what tends to cause gastrointestinal upset when using other, cheaper MCT oil versions.


Bulletproof Coffee Nutrition Facts

Bulletproof Coffee with Brain Octane oil

  • Calories: 458 for a cup with two tbsp grass-fed butter and two tbsp brain octane oil.
  • Fat: 50.6g
  • Protein: 0g
  • Carbs: 0g

Bulletproof coffee with Coconut oil

  • Calories: 320 for a cup with two tbsp grass-fed butter and one tbsp Coconut oil.
  • Fat: 38g
  • Protein: 0g
  • Carbs: 0g

Bulletproof coffee with MCT oil

  • Calories: 300 for a cup with two tbsp grass-fed butter and one tbsp MCT oil.
  • Fat: 38g
  • Protein: 0g
  • Carbs: 0g
Alternative Sweeteners

Alternative Sweeteners and Bulletproof Coffee

Sometimes you have a craving for something sweet, especially when switching to a butter coffee diet from your habit of loading your bitter black coffee with sugar. Several sweeteners are considered acceptable for BP Bulletproof consumption. All the alternative sweeteners come from natural plant sources but don’t have the same effect on your blood sugar as plain white sugar.


This is a combination of three sweeteners: ribose, erythritol, and monk fruit. All three are considered sweeter than white sugar, so just a little will give you the sweet taste you are looking for.


Xylitol has one less carbon atom than traditional sugars, which affects the way you metabolize it. It doesn’t spike insulin, and the effect on blood sugar is negligible. It doesn’t encourage the bacteria in your mouth that cause tooth decay, either. However, many people who already have a GI condition may be sensitive to xylitol. Make sure your xylitol is not derived from corn, which may be genetically modified.


Like xylitol, erythritol doesn’t impact blood sugar and won’t encourage bacteria that cause tooth decay. It is slightly less sweet but doesn’t cause GI distress either. You may find that BPC and keto diet sites recommend this sweetener a lot. When the following keto, coffee is not restricted, but sugar is.


Stevia is a plant extract and is considered about 300 times sweeter than sugar. It doesn’t impact blood sugar and can’t be used by mouth bacteria to rot teeth. However, it has been noted to have a bitter aftertaste for some people, so you may want to choose a different sweetener if you don’t like the flavor.

Benefits of Cutting Sugar

  • Reduces cravings for carb-heavy foods
  • Fewer calories are stored as fat
  • Reduced inflammation in the body

Bulletproof Coffee Benefits

Of course, there is no shortage of promises from Bulletproof Coffee’s maker, so let’s dive into some of the benefits to see if they outweigh the negative comments on price and quality.

Some claimed benefits of Bulletproof Coffee are:

  • Weight loss
  • Improved mental function
  • Clarity
  • Increased energy


Mental Clarity

Trials call for more research and stronger studies to fully determine whether or not the ingredients in this product can enhance your mental state.

Caffeine consumption is a given in today’s society as we look for the energy to do what we have to do and what we want to do. People consume sugary drinks loaded with caffeine to beat the energy drop that comes with a high carbohydrate diet.

However, caffeine affects other health issues as well because of the places we find caffeine. Coffee beans and tea leaves naturally contain phytonutrients and antioxidants, which work with the caffeine to have an overall effect on health.

Benefits of MCT Oils

MCTs are natural antibiotics that can help fight off the harmful bacteria that we may consume with our food. It also helps maintain a healthy pH balance for your gut, with healthy bacteria remaining to process food. This may be especially helpful for people who are suffering from diseases such as food sensitivities.

Using this oil, whether to create a ketogenic coffee or not, can help you lose weight since these fatty acids are converted quickly to energy and require three steps to break down rather than the 25 steps needed by sugar. Even someone who does not follow a restricted eating plan will reach ketosis after consuming the MCTs in the oil. Shortened processing and lack of enzymatic help make them anti-inflammatory since your body does not need insulin to process them.

Your body can use the ketones produced by digested MCTs more efficiently than the glucose produced by sugar. Many people see a lift in a mental fog almost immediately after adding MCTs to their diet. When inflammation is reduced in the brain, the neurons can process the necessary chemicals to grow new neurons and increase memory capacity.

Intermittent Fasting

Bulletproof Coffee and Intermittent Fasting

Intermittent fasting helps the body do several things such as reduce insulin levels and prepare the body to use body fat as needed for function. The body is used in times of plenty and times of famine, and so has adapted mechanisms to survive when food is scarce.

It has been found to aid in weight loss and to maintain a healthy weight. It temporarily increases your metabolic rate while reducing your caloric intake. Studies show that it can help prevent muscle loss better than a continuous restricted-calorie diet. Used in conjunction with something like the Bulletproof Diet, you may reach your weight loss goals and keep them.

Benefits of Intermittent Fasting

  • Reduced inflammation
  • May help reduce belly fat

Bulletproof Coffee and Keto Diet

It seems most people praising Bulletproof Coffee are those on the ketogenic diet. A lot of people on the keto diet practice intermittent fasting with Bulletproof Coffee to lose weight faster.

However, some experts don’t even think the ketogenic diet is the way to go.

Ketosis is the metabolic process that your body begins when there aren’t enough carbohydrates to produce glucose. This process is the goal of the ketogenic diet. This should not be confused with ketoacidosis, a life-threatening condition where ketones build in the body, creating an acidic environment, which can damage internal organs.

Once your body uses its store of glycogen, it switches to using fat as fuel. This is a genetic response to times when food was unavailable to our Paleolithic ancestors. Fat is processed into ketones, which have more energy than glucose. Ketones are also able to pass through cell membranes without needing any help from other enzymes like insulin. The brain can use them just like glucose, which may be better. In fact, the ability of brain cells to use glucose as fuel breaks down as cells age. This is not the case with ketones.

Bulletproof Coffee and ketosis

The body is still able to produce glucose for the few cells which require it to function. It will use protein and glycogenesis to make what it needs. This is why the body may use its muscle in times of starvation. However, most diets provide an adequate amount of protein, so this is not generally an issue.

Ketosis helps you lose weight when it uses stored body fat to create ketones. Unlike sugar and glucose, ketones are not stored in the body as further body fat. According to Advances in Experimental Medical Biology, excess ketones are expelled from the body through urine and the breath. MCT oil can be processed into ketones very readily, so it provides energy but isn’t stored on the body if there is excess.

Benefits of Ketosis

  • Reduced inflammation
  • Reduced cravings
  • Improved memory and focus
  • Weight loss due to reduced carbohydrate level
  • Increased energy level
Paleo Diet

Paleo Diet Vs. Bulletproof Coffee

The Paleo diet could be considered a caveman diet, as you would eat what your Paleolithic ancestors would eat, such as meat, vegetables, and nuts. Grains would not be allowed since they are a domestic plant that hasn’t been around long in the scheme of things. No dairy would be allowed either since the idea is that our ancestors were foraging nomads and did not keep domestic animals for dairy products.

The Bulletproof diet does allow limited amounts of dairy, especially by using butter and ghee in coffee, which is usually added to increase the fat content. The menu is generally based around some servings of allowed foods, and counting calories are not encouraged.

Both diets encourage the consumption of food that is as close to its original form as possible. Bulletproof takes it a step further and includes cooking recommendations for certain types of food.

These diets are incredibly low in carbohydrates, particularly the highly refined carbohydrates found in bread, pasta, and cereal. The body is forced to use its fat to create energy since not enough carbs are being taken to make glucose. This is why people generally find that they lose weight on either diet.

Bulletproof Coffee and Weight Loss

Another claimed benefit of Bulletproof Coffee is weight loss. Users on the ketogenic diet typically drink this coffee because it’s designed to keep you feeling full for long periods.



Studies have shown that MCT oil is effective in promoting weight loss without any adverse effects. They’ve also found that MCT oil effectively promotes weight loss and prevents weight gain than LCT (Long Chain Triglycerides).

Another study by the Journal of the Academy of Nutrition and Dietetics pointed to weight loss. Still, more research was needed: “Replacement of LCTs with MCTs in the diet could potentially induce modest reductions in body weight and composition without adversely affecting lipid profiles. However, further research is required by independent research groups using large, well-designed studies to confirm the efficacy of MCT and to determine the dosage needed.”


The caffeine in coffee can increase the metabolic rate in normal-sized and obese individuals. A high metabolic rate means you’ll burn more calories.

The American Journal of Clinical Nutrition wrote: “The thermic effect of the meal was significantly greater after coffee than after decaffeinated coffee and again fat oxidation was significantly greater after coffee. In conclusion, caffeine/coffee stimulates the metabolic rate in both control and obese individuals; however, this is accompanied by greater oxidation of fat in normal-weight subjects.”

It’s no surprise that caffeine can aid with weight loss, but this product’s exact formula has no research behind it.


Bulletproof Coffee and Mycotoxins

Mycotoxins come from fungi and molds that can form on grains and legumes, much like coffee beans. They can be thought of as fungal poisons. They are more commonly found in hot and humid climates, where many beans are purchased. They feed off the carbohydrates found in grains, legumes, and some fruits. This is why they are likely to be found in alcoholic beverages. There are many types of mycotoxins, and some fungi and molds can produce more than one type.

However, most mycotoxins are not found in commercial coffee brands and the molds and fungus, which produce mycotoxins, are susceptible to the heat of roasting and pasteurization. Studies show that mycotoxins’ level on commercial coffee grinds is minimal or within a safe level.

Other foods with mycotoxins:

  • Raisins
  • Cereal grains
  • Peanuts
  • Beer
  • Wine
  • Legumes

There have been debates about the mycotoxins purported to exist in coffee and how research has found that most fungi and molds don’t survive the roasting process so that no mycotoxins can be found in the coffee created from the roasted beans, according to research published in the Journal of the Association of Official Analytical Chemists.

Joe Rogan brings up new coffee processing techniques such as wet-processing and that coffee farmers are better educated on how to store coffee beans, so they aren’t exposed to the wet conditions which encourage mold growth and mycotoxin production by default. Beans may not be dried completely using the previous dry processing method, and mold may grow on the beans.


Science Behind Bulletproof Coffee

Since Dave Asprey emphasizes the quality of ingredients in his Bulletproof Coffee, we’re going to look at what science has to say about his claims.

Bulletproof Coffee Beans

Bulletproof’s entire blog stresses mycotoxins’ impact on coffee and how their coffee beans are “certified clean” and lab-tested.

Mycotoxins are secondary metabolites that fungi produce and occur naturally in most foods, including cereals, coffee, and groundnuts. They usually contaminate food during pre- or post-harvest periods or during processing.

According to Carcinogenesis, Aflatoxin is a mycotoxin that frequently affects maize, groundnuts, and other dried fruits.


According to Toxins, another popular mycotoxin is called ochratoxin A (OTA), and this one is common in food products such as cereals, coffee, spices, and licorice. OTA has immunosuppressive, teratogenic, and nephrotoxic properties.

Grass-Fed Butter

International Journal of Vitamin and Nutrition research shows that grass-fed cows produce high amounts of omega-3 fatty acids in their milk. Their quality also stands out compared to their conventional counterparts.

Nutrition Journal writes that “grass-fed beef tends to be lower in overall fat content, an important consideration for those consumers interested in decreasing overall fat consumption.”

There is also some evidence to suggest that butter can promote brain function.

According to Asprey: “healthy fat will sustain your energy for hours, balance hormones, and boost cognitive function. With butter, you’re not only getting essential fatty acids and other nutrients; it helps make the creamiest cup of coffee you’ll ever have.”

Brain Octane Oil (MCT)

There is some evidence that MCT can help promote ketosis.

However, just adding MCTs to your diet won’t lead to any fat loss by itself. It would help if you still reduce your overall calorie intake.

The American Journal of Clinical Nutrition wrote that “consumption of MCT oil as part of a weight-loss plan improves weight loss compared with olive oil and can thus be successfully included in a weight-loss diet. Small changes in the quality of fat intake can, therefore, be useful [in enhancing] weight loss.”


Here’s what some customers are asking: MCT Oil may be shown to work, and if that’s the case, why not buy MCT Oil and save yourself the money? Adding it to coffee may not be as effective for some as it is with others.

Side Effects

Bulletproof Coffee Side Effects

Some people may experience unwanted side effects from Bulletproof Coffee, so we broke down the main ingredients and their potential for delivering adverse reactions.


MCTs are generally safe but can cause:

  • Nausea
  • Irritability
  • Stomach discomfort
  • Vomiting
  • Diarrhea


Caffeine, when you take it in high doses, can cause:

  • Stomach irritation
  • Nervousness
  • Restlessness


Various common side effects associated with Bulletproof Coffee ingredients or the diet users follow include:

  • Under-eating (yes, that’s bad)
  • Nutrient deficiencies
  • Increased stress level
  • Headaches
  • Shortness of breath
  • Sleeplessness

Bulletproof Coffee Warnings

  • Please consult with your physician if you’re pregnant or taking any serious medications.
  • If you have insomnia, you have to be careful with the timing and frequency of drinking Bulletproof Coffee.
  • Might not be suitable for those with urinary incontinence because caffeine is proven to be diuretic.

Bulletproof Coffee can make you feel fuller to the point where some people would happily skip meals. Sometimes, this means you’ll end up eating fewer calories than you should be. Research shows that low-calorie diets can increase cortisol levels, which has its list of symptoms, according to Psychosomatic Medicine.


According to Truth in Advertising, the makers of Bulletproof Coffee were sued for adding too much butter and coconut oil in their coffee.


Bulletproof Coffee Alternatives

There is a handful of other companies tearing a page out of the weight-loss coffee book. They include:

Where to Buy

Where to Buy Bulletproof Coffee

  • Official website
  • Amazon.com
  • iHerb
  • Vitamin Shoppe
Pros and Cons

Bulletproof Coffee Pros & Cons


  • Organic and mycotoxin-free coffee beans.
  • Butter is a great source of vitamins A, E, & K.
  • The body uses MCT oil directly as energy rather than store it as fat.


  • Complaints on poor taste
  • Too many outrageous claims
  • No studies supporting the formula
  • High price
What Can I Add?

What Can I Add to Bulletproof Coffee?

A butter coffee diet doesn’t seem to be very palatable, but there are ways to add flavor and nutrition to this drink. For those who follow keto, coffee is a way to add nutrients without adding calories. These are some of the most simple additions:


Cinnamon has been shown to have healthy properties of its own, such as reducing inflammation and being antiseptic. It is normally used as a flavoring, especially in treats, so adding it to your BPC won’t add any calories, just flavor.

Cocoa powder

Dark chocolate has long been found to have several health benefits, especially for the heart. Adding the powder to your coffee can give you a taste without the sugar of eating an entire candy bar.

Collagen Peptides

Collagen is the substance found in hair and nails. Marketed collagen is broken down further, so it doesn’t gel in your liquids like its relative, gelatin. It has been shown to have antioxidant and anti-inflammatory properties and doesn’t add flavor to your drink.

Pink Salt

Pink salt tends to have other nutrients than just plain white table salt. Use it to create an electrolyte drink. Your body needs salt and potassium to balance out its ability to take in and process out water in your body. Adding this may help you drink Bulletproof coffee as part of a low carb diet and find you are missing some electrolytes.

Maca powder

Maca root is considered a superfood, most notably an adaptogen, or food that helps the body adapt to the environment around it. This is especially helpful for dealing with stress or illness.

Pink Himalayan Salt

This salt comes from a mine below the Himalayas and is thought to be the ancient sea’s remnants. It is pink from the different types of minerals trapped when the salt crystals formed millions of years ago. It contains the atomic elements for salt and magnesium, and potassium, important minerals the body needs to regulate several functions, most notably the kidneys and muscles. It may be an excellent addition to your drink if you are looking to replace some minerals while drinking coffee on the keto diet.

Peppermint oil

This oil has several properties, including being anti-spasmodic. This effect is especially beneficial for people with digestive issues. Adding some of this may counteract the stomach upset that comes with drinking acidic coffee and make it taste like a candy cane.

Lavender oil

Lavender has long been used in lotions, soaps, and essential oil for its relaxing properties. Adding it to your coffee will give you those same properties. It seems counterintuitive when you’re consuming caffeine to give yourself an energy boost, but the lavender works to calm the nerves in your brain, which can be inflamed by a high sugar diet. This allows the neurons to use the neurochemicals more efficiently and eases the energy used up by being stressed.

Pure Vanilla

Vanilla is an antioxidant, which will prevent cell damage from free radicals found in the environment. It doesn’t add carbs or calories to your drink, just a hint of flavor that reminds you of a sugary treat.


Bulletproof Coffee Keto Recipes

The simplest recipes include nothing more than using grass-fed butter in coffee, with MCT oil added for that ketogenic boost. These recipes can add some flavor to this energy-booster.

Most begin with the base of coffee. This can be your favorite blend of Arabica beans, but it is recommended to look for a single source, organic blends, if possible. This may reduce the flavor conflict found in coffee that has grinds from multiple sources. It is also recommended to brew using filtered water to prevent any chemical contaminants found in tap water.

The idea behind adding grass-fed butter in coffee is that animals that are allowed to graze naturally produce milk that is higher in certain vitamins and minerals by the grace of being able to eat the more natural food themselves rather than carb-heavy grains. Using regular butter is just fine if you can’t afford the grass-fed type. You can also use ghee in the coffee if you cannot tolerate dairy.

Using MCT oil in the coffee is also a given since your good fats will come from. If pure MCT oil causes you gastric upset, you can put coconut oil in the coffee instead. It doesn’t have the same fatty acid density, but you’ll still get the benefits.


  • 1-2 cups freshly brewed coffee
  • 2 tablespoons unsalted butter
  • 1 tablespoon MCT or coconut oil

Blend with a blender to create a frothy latte type drink. If you don’t blend, the coffee oil will sit on top. You can top with pumpkin pie spice or cinnamon for a sweeter treat.

There are also ways to make bulletproof tea and iced bulletproof coffee. Use your favorite black tea blend since the caffeine is part of the energy boost. Do not use coconut oil in the iced coffee as it will congeal in the cold liquid.

Bulletproof Coffee and social media

Social Media

Bulletproof Coffee on Social Media

To get the word out about Bulletproof coffee, the creator has to have a way to reach millions of readers, viewers, and even naysayers. David Asprey has a website dedicated to his books, products, podcasts, and blog, where he shares his thoughts and the research associated with his products.

His Facebook page is often updated with links to his blog articles or to interviews he has done on TV or online. You can be up to date with his products and what he’s publishing online by following his page.

The Twitter account offers links to his articles and interviews and interesting news articles that reference new and current studies being done about different kinds of diets, not just the Bulletproof Diet.

Research Studies

Studies on Bulletproof Coffee

Exposure assessment to ochratoxin A in Catalonia (Spain) based on the consumption of cereals, nuts, coffee, wine, and beer.

Greater rise in fat oxidation with medium-chain triglyceride consumption relative to long-chain triglyceride is associated with lower initial body weight and a more significant loss of subcutaneous adipose tissue.

According to the International Journal of Obesity and Related Metabolic Disorders, this study found that men consuming medium-chain triglycerides lost more body fat than those eating long-chain fats such as olive oil. They also discovered that men with a higher weight seemed to oxidize the fat at a slower rate. There was no indication that any participant gained body fat while consuming these fats.

Medium- and Long-Chain Triacylglycerols Reduce Body Fat and Blood Triacylglycerols in Hypertriacylglycerolemic, Overweight but not Obese, Chinese Individuals

According to the journal Lipids, when consuming medium-chain triglycerides, men lost more body fat than those who were not. It is noted that those who began at a higher weight lost more slowly, most likely due to increased insulin resistance due to poor diet.

What Users Are Saying

What Users Are Saying

“Best coffee flavor ever! Fresh and smells so good brewing!”

“I tried this as I have been trying to eat more keto-friendly but this coffee tastes awful.”

“My stomach was bothering me so much after drinking coffee I had to stop drinking; however, I tried bulletproof and it does not bother my stomach. I’m so happy to be able to enjoy coffee again. This coffee has a great taste and flavor.”

Bulletproof Coffee Ingredients
Bottom Line

The Bottom Line Bulletproof Coffee

If everything in the “bulletproof process” is as true as they claim, they’re certainly following some of the most effective ways to minimize mycotoxins in coffee. However, if there’s anything we’ve learned in all our years of researching diet products, it’s this: don’t believe everything you hear.

We like some of the ingredients in this product — specifically, caffeine. However, there are too many negatives floating around for us to fully back this brew.

If you want to try it out, be our guest, but there are more natural and more effective ways to lose weight. If your goal is to shed pounds, boost metabolism, increase energy, and burn fat, you need a support system that works and is supported by positive reviews.

Among the best programs we’ve seen is Noom. It provides help to “change your diet for a lifetime.” There’s no restrictive dieting, so there are no worries about giving up this food or that snack. You also get one-on-one coaching and assistance from doctor-authored articles and personalized meal plans.

Additionally, the team behind Noom is confident in their program, they’re offering a free trial offer.

Learn More About Noom »
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Bulletproof Coffee

What are the ingredients in Bulletproof Coffee?

The ingredients in Bulletproof Coffee are water, coconut milk, unsalted butter, MCT oil, vanilla extract, unsweetened cocoa powder, cinnamon, and erythritol.

What are the side effects of Bulletproof Coffee?

The possible side effects of Bulletproof Coffee are decreased metabolism, nutrient deficiency, and upset stomach. These effects are uncommon; however, they are possible in high doses.

Does Bulletproof Coffee work?

Yes, Bulletproof Coffee works. Those taking this product will feel a boost in cognitive ability and will also experience less annoying urges to snack on extra food.

What is the price of Bulletproof Coffee?

The price of Bulletproof Coffee is $14.99 for 12 ounces of ground coffee.

How should I take Bulletproof Coffee?

To get the best results from Bulletproof Coffee, drink the product every morning when you wake up.

Where can I buy Bulletproof Coffee?

Bulletproof Coffee can be purchased using their Official Site.

How do I contact Bulletproof Coffee customer service?

To contact customer service regarding Bulletproof Coffee, locate their telephone number which can be found on their website. Scroll all the way to the bottom and you will see a tab that says ‘Contact Us’.

Can I return Bulletproof Coffee?

If you are not satisfied with Bulletproof Coffee then you can return the product within 30 days of purchase. However, this only applies to products purchased directly from the official website.

What are the most common complaints about Bulletproof Coffee?

The most common complaint regarding Bulletproof Coffee is that it is recommended to take it instead of eating breakfast. Due to this, many question whether or not they are losing key nutrients.

Bulletproof Coffee Reviews