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The Slender Blend Review - 15 Things You Need to Know

We’re all searching for the right diet product. We wanted to know if The Slender Blend was the one, so we checked on the ingredients, side effects, customer service, and clinical research. The real test is consumer experiences, so we took hundreds of those into consideration as well. Then, we summarized and refined to give you the info you need.

The Slender Blend can be purchased through their Official Site.

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

What is The Slender Blend?

The Slender Blend is a protein supplement made to take the place of a meal. It contains:

It’s said to help weight loss since it offers fewer calories than what actual meals provide. Users consume only 150 calories from one serving of The Slender Blend meal replacement. That’s a standard amount of calories, but it’s the addition of guarana and green tea that make this meal replacement different. Do these three ingredients have the potential to help you lose weight?

  • Journal of the American College of Nutrition – “Whey protein supplementation seems to improve body weight, total fat mass, and some CVD [cardiovascular] risk factors in overweight and obese patients.”
  • Journal of Agriculture and Food Chemistry – The guarana plant is often utilized for caffeine content or stimulant effects.
  • DMS – As for the green tea, “green tea, used as a daily beverage, has shown beneficial impacts for the health, especially its anti-obesity effects. Available evidence shows that green tea can interrupt lipid emulsification, reduce adipocyte differentiation, increase thermogenesis, and reduce food intake, thus green tea improves the systemic metabolism and decreases fat mass.”

The Slender Blend Competitors

Other similar products: Shakeology, 18 Shake, 310 Shake

How did The Slender Blend Start?

Protein World company manufactures The Slender Blend protein meal replacement.  This company has been making and supplying this product since it began in 2004. Protein World is known for its specialization in health products that contain high levels of protein, but they’ve been in some hot water before.

Their products are readily available from the company website and can be shipped internationally.


The Slender Blend Claims

Protein World Company makes some promising claims regarding their protein supplement. We can start with the most glaring, “Lose up to 4 pounds in a week.” Other promises include:

  • It’s easy to use
  • Amazing taste
  • Works for men and women
  • No sugar added
  • Speeds metabolism
  • Gluten-free

Of course, there are others, but we don’t have all day.

The Slender Blend does have caffeine, which can boost metabolism and aid in fat burning. We’ve seen some studies backing the use of caffeine for weight loss, so we’re off to a good start.

Once you eat a meal, thermogenesis occurs and raises your body temperature, causing calories to burn, states MayoClinic. Fat burners (like caffeine) are consumable to trigger the process of thermogenesis. This way, your body can burn calories without having to eat. Fat burners work to improve the body’s metabolism.

The Slender Blend ingredients


The Slender Blend Ingredients

Let’s take a quick look at the ingredients in this supplement and what science has to say about them. Maybe we’ll find some hard evidence that they work.

Guarana Extract

Named after the tribe of Guarani, Guarana is a plant found in the Amazon and is used for a number of different applications. The guarana seeds are most commonly used in a wide range of energy and weight-loss products. Guarana is used to help with:

  • Mental fatigue
  • Headaches

Guarana is also used as a flavoring ingredient in some drinks and foods. There have been concerns raised over the long-term consumption of guarana due to its high levels of caffeine, according to the FDA.

As effective as caffeine may be in aiding weight loss, too much can cause serious side effects, if the manufacturer isn’t careful.

Green Tea Extract

Green tea is the product of steaming Camellia Sinesis leaves at very high temperatures. It contains high levels of antioxidants. Unlike black tea or oolong tea, green tea does not undergo fermentation. Green tea has been used for centuries in Chinese medicine.

Most notably is its use in weight loss, and research published in the Journal of Research in Medical Sciences found it to be effective in doing so.


A type of caffeine that does not contain water, anhydrous caffeine comes in the form of an odorless white powder. It’s a central nervous system stimulant and is one of the most used stimulants in the world, according to Caffeine for the Sustainment of Mental Task Performance.

Caffeine anhydrous is said to boost energy levels, leaving its users feeling alert and energized.

Does The Slender Blend work

Does The Slender Blend Work?

Looking at their website, you’ll notice there is no research posted on the formula. This is upsetting since there are some quality ingredients here. In fact, with so many ingredients that are backed by research, we’re a little shocked the makers aren’t posting that information.

According to the company that supplies The Slender Blend diet, this product is used by leading health professionals to help their clients lose weight. Studies say that meal replacement can go a long way to help dieters in managing their calorie intake and boosting metabolism, but they aren’t for everybody.

The active ingredients found in The Slender Blend are said to promote fat burning since it contains components of caffeine. Caffeine anhydrous, guarana extract, green tea extract, and yerba mate all contain caffeine – too much of it can cause serious side effects and negatively impact a user’s results.

According to some clinical research, caffeine boosts metabolism because it releases neurotransmitters. This increases energy levels in the body, which raises the rate of metabolic reactions.

Even with all these benefits, it is not clear as to whether The Slender Blend works. According to customer reviews, some users will swear by it – while others claim they didn’t see any results.

Details on The Slender Blend and Weight Loss

We want to look closer at this product’s ability to help customers lose weight. This is, after all, why users are buying it in the first place. Like we’ve mentioned, there are some solid ingredients here, and we found some research supporting the use of green tea extract and caffeine for weight loss. So why don’t more people see the results they want?

Guarana Extract

In 2001, a study tested guarana amongst three herbal medicines on their effect on weight loss. Three groups of subjects participated in this research; some were overweight and other healthy. Their meals included guarana and other ingredients. Using ultrasound technology, gastric emptying was measured, and their body weight was recorded.

According to results, a combination of herbs, including guarana extract, caused a delay in gastric emptying. As a result, the healthy participants retained their weight while the overweight participants recorded significant weight loss. One study published in Pharmacology, Biochemistry, and Behavior found that guarana could even boost cognitive performance.

However, there is insufficient scientific evidence that guarana works for weight loss. It may be a potential therapeutic agent for obesity, per Phytotherapy Research

Yerba Mate Powder

UPDATE: As of 2020, Yerba Mate Powder is no longer a listed ingredient.

In 2014, a study by Nutrition & Metabolism tested healthy male and female subjects who took 1000mg yerba mate. The participants were to ingest the supplement before workouts. These exercises ranged from low to high intensity. Their energy expenditure, as well as uptake of oxygen, was measured before workout and post-workout.

The study concluded, “Acute YM ingestion augments the exercise dependent increase in FAO and EEFAO at submaximal exercise intensities without negatively affecting maximal exercise performance. Suggesting a potential role for YM ingestion to increase the exercise effective for weight loss and sports performance.”

Yerba mate may also increase antioxidant capacity in the body, according to the Nutrition Journal

Green Tea Extract

In 2005, a study determined if the benefit of green tea aided in weight loss. Green tea was tested on female adults who have a BMI of more than 27.7. During this research, these women were placed on a low energy diet with green tea as a supplement or any other alternative. At the end of the study, results showed changes in fatty acids levels as well as significant weight drops in most of the subjects, according to Physiology and Behavior.

Caffeine Anhydrous

UPDATE: As of 2020, Caffeine Anhydrous is no longer a listed ingredient.

A test was done on subjects to determine the effect of caffeine on the human body. Even though the study details are limited, most subjects recorded positive thermogenic results. The ingredients in caffeine aided in weight loss as well as decreased expenditure of energy. According to the study, caffeine increased the toning of muscles and the production of lactate.


The Slender Bender protein powder comes in a variety of flavors, including:

  • Vanilla Ice Cream
  • Milk Chocolate
  • Cookies & Cream
  • Chocolate Mint
  • Strawberry Milkshake
  • Banana Split
  • Salted Caramel
  • White Chocolate & Raspberry
  • Peanut Butter
  • Fudge Sundae
  • Vegan Vanilla
  • Vegan Chocolate
  • Vegan Strawberry
  • Vegan Salted Caramel

How to use The Slender Blend


How to Use The Slender Collection

The Slender Collection is available in two plans. You have a choice between vanilla, summer fruits,  or chocolate-flavored porridge.

In either of the plans, you get:

  • The slender collection weight-loss protein powder
  • Hunger Buster capsules
  • Protein world shaker
  • Fat metabolizer capsules
  • 30-day workout and recipe challenge

The Protein Powder

You can use The Slender Collection protein powder to whip up protein shakes. These shakes are useful post-workout or anytime you want to curb a craving. You only need to mix it with water in correct proportions. It’s said that you only consume 141 calories for every 24g of protein serving.

The Fat Metaboliser Capsules

Users take one capsule before breakfast and lunch for the first week. The dosage is upped to two capsules before breakfast and lunch from the second week.

They are said to be good alternatives to caffeine-dependency since they are high in this ingredient. It’s urged not to drink coffee while taking this supplement.

The Hunger Buster Capsules

These help you feel fuller, longer. Staying satisfied prevents you from overeating. You are required to take the capsules at different intervals throughout the day.

The Slender Collection Porridge

The porridge is an alternative to your usual breakfast. It’s said to give you the nutrition you would get from eating a typical breakfast.

The 30-Day Challenge

This is a workout regimen that can take place alongside the use of The Slender Collection diet supplements.

The Slender Blend side effect

Side Effects

The Slender CollectionPotential Side Effects

As much as the makers claim that their product is made from natural ingredients and don’t cause unwanted side effects – the ingredients in the product are linked to several adverse reactions.

The main source of concern is the amount of caffeine present in the product.

Side effects include:

  • Sleeping issues
  • Nervousness
  • Increased heart rate
  • Sweating
  • Vomiting
  • Increased body odor


Caffeine is said to be safe at times, but this doesn’t mean it can’t cause a reaction if you take too much of it. Caffeine is likely unsafe when consumed in large amounts, and can cause:

  • Headaches
  • Nausea
  • Vomiting
  • Irritability
  • Increased heart rate
Product Warnings

The Slender Blend Product Warnings

When you decide to take The Slender Blend diet supplement, what the reviews will not tell you is that you need to continually replace your meals with this product for it to work.

Even though it boasts to be a healthy supplement, the number of calories your body needs varies based on the activities involved in your day.

For some people, the 150 calories may be too low. This leads to energy deprivation and deficiency in essential amino acids. Therefore, be sure to understand all that is at stake before embarking on the diet plan.

The Slender Blend And Pregnancy

According to the protein world the slender blend results experts, users can use the slender blend diet supplement while pregnant and when breastfeeding. Even so, it is highly advisable to consult your doctor first before use.

The Slender Blend Lawsuits

Protein World has been in the spotlight – and not in a good way. They were accused of selling supplements containing up to 17 times more carbs than listed on the label, states DailyMail.

Benefits & Results

The Slender Blend Benefits and Results

There are a few benefits associated with The Slender Blend – but none of them are backed by science. They include:

  • Boosted metabolism
  • Weight loss
  • Muscle growth
  • Appetite suppression
  • Calorie control

We can look at the ingredients, and some of them we like. We just wish they posted some evidence supporting the formulas.


The Slender Blend Price

The cost of The Slender Blend plan will depend on where you purchase it. The product is available online. You can check for The Slender Blend Amazon sale or buy directly from the manufacturer’s website. To save money, you are advised to look out for the slender blender cheap shipping costs depending on where you live.

The Slender Blend Alternatives

There are numerous alternatives on the market when it comes to meal replacement shakes. A simple search on the internet will reveal hundreds, if not thousands of different plans, supplements, and products that claim to work better than The Slender Blend.

However, it’s hard to determine which alternative is better since most of them are made using the same ingredients. Always look for research on the ingredients and talk of the formula.

Some alternatives to The Slender Blend include:

  • Whey Protein
  • Shakeology
  • 18 Shake
  • Special K Protein Shakes

What Users Are Saying

“I have been using this product as part of my weight loss and fitness plan. So far I am successfully losing weight and gaining muscle from a healthy diet and exercise plan, this product has been great supporting me with both. Favourite part is how good it tastes, it tastes like white chocolate and its very versatile in smoothies. I don’t know how much it actually works, but for me psychologically having this at the end of a workout is a treat and it makes me feel really good and want to do it everyday.”

“Disgusting shake – I bought this to lose a few pounds but when I made a shake it was too runny for me prefer a thick shake can’t drink it flavour wasn’t too bad.”

“Low calorie but high protein….. I want calories. Lots of them. This tastes good but not very useful to anyone who is serious about fitness goals. This is more for fad dieters who hit the treadmill then head home.”

Bottom Line

The Bottom Line on The Slender Blend

Should you replace your current meal replacement with The Slender Blend? We like that there are only 150 calories in each serving and the vitamin profile is strong, but we’re skeptical about giving this one the green light because it doesn’t necessarily taste the best. Plus, we couldn’t find any information on the company other than when the website was opened.

The Slender Blend Cons:

  • Customer complaints on poor flavor
  • Too many potential side effects due to stimulants
  • No scientific evidence supporting the formula

Want to lose weight without fighting bad taste? We suggest going with a program that’s backed by expert and clinical support.

Among the best programs we’ve seen this year is one called Noom. The program includes food tracking, an extensive food database managed by nutritionists, expert advice, human coaching and much much more.

Plus, the company behind Noom is offering a free trial offer as a sign of confidence in their program.

Learn More About Noom »
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The Slender Blend

What are the ingredients in The Slender Blend?

The ingredients in The Slender Blend are guarana extract, green tea extract,cayenne, anhydrous caffeine, yerba mate, and whey protein.

What are the side effects of The Slender Blend?

Possible side effects based on the ingredients would be stomach upset, diarrhea, nervousness, nausea, anxiety, headaches and sleeping problems.

What is the price of The Slender Blend?

The 1.2 kg size of the The Slender Blend is sold for about $45 on the official website.

Where can I buy The Slender Blend?

You can find the product to buy on the official website, proteinworld.com and Amazon.

How do you use Slender Blend?

Mix the 1-2 scoops of the protein powder adequately to form a juicy mixture and consume freely.

Where can I buy The Slender Blend?

The Slender Blend can be purchased using their Official Site.

How do I contact The Slender Blend customer service?

You can contact The Slender Blend customer service to speak with an expert via email at advice@proteinworld.com or call +44 800 011 9421.

Can I return The Slender Blend?

Yes, you can access a return within 28 days of receipt of the product. Refund is only accepted for unopened product.

What are the most common complaints about The Slender Blend?

Some users of the product reported having stomach cramps and gas after consumption.

What does Slender Blend do?

Slender Blend acts as a weight-loss meal replacement shake.

Can you mix Slender Blend with water?

Slender Blend can be combined with water or milk.

How many calories are in a Slender Blend shake?

One serving of Slender Blend contains 143 calories.

5 The Slender Blend Reviews

  • Have tried all their shake flavors
    Chelsea (Verified Purchase)

    I’ve done the Slender Plan 4 times and tried all of the Slender Blend products. I don’t understand reviews complaining about poor flavor? I’ve had them all and they’re all good. Also, the Slender Plan does not say to replace all of your meals, that would be absurd. You only replace one meal with the shake, if you don’t like the porridge you COULD replace two if you choose. You’re also supposed to have 2 snacks and a healthy balanced dinner in the evening. I’ve had great results with these products. Anyone putting on more weight, should try measuring their waistline instead of looking at the scale. If it’s not the way you’re eating, and you really are putting on weight, then maybe the product just isn’t for you.

  • Michelle (Verified Purchase)

    Bought the four week plan. I have just finished the first week and to my horror I have put on 6lbs. The shakes taste salty and leave the salty taste in your mouth for hours after drinking. I constantly feel bloated. I emailed the company and they don’t have any concerns that I have gained they just advised to weigh at the same time every day, which I was doing in the first place. I wouldn’t advise this plan at all. I lost over a stone on the forced living shakes but got a bit bored so thought the plan would make it easier but now I’m regretting it after this gain.

  • Lesce

    Hi I am from SA. Port Elizabeth how can I order?

    • Victoria (Editor)

      Hi Lesce. Sorry, but we are not associated with the company, we did found it online though. If you’re looking for a product that is backed by science and is proved to bring about weight-loss results, you might want to try Dietspotlight Burn.

  • changed formula now its nasty
    dean (Verified Purchase)

    yes. changed the formula and now its undrinkable. just tastes like all the other powders now.