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SlimFast Keto Review - 13 Things You Need to Know

Slimfast Keto: another well-known company on the keto train? For over forty years, SlimFast has produced weight loss products like nutritional bars and meal replacement shakes.

SlimFast Keto provides a plan to support dieters who wish to try a ketogenic diet. Along with a sensible diet and regular exercise, the program claims that dieters can see results in one week.

Our research team wanted to look into the SlimFast Keto products to determine their overall effectiveness as part of the ketogenic diet, including ingredients and clinical research. The research team found lots of information, including some things you’d never guess about the keto diet.

SlimFast Keto can be purchased through their Official Site.

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

What is SlimFast Keto?

The SlimFast Keto line provides products for consumers on a high-fat, low-sugar, low-carbohydrate ketogenic diet. The keto diet is to keep users in a fat-burning state called ketosis.

SlimFast Keto products include keto smoothies and bars and keto-compatible supplements. SlimFast claims that following their low-carbohydrate diet plan will provide some benefits, including rapid fat burning, hunger suppression, and ability to eat foods like bacon and steak.

Slimfast Keto makes a lot of claims, but are any of them true? Before delving into this keto product line, let’s review what the science has to say about this kind of diet and some of the ingredients found in Slimfast Keto products:

  • Experimental and Clinical Cardiology – Research found that on a ketogenic diet, the weight and body mass of obese patients “decreased significantly.”
  • Medical News Today – MCT oils such as coconut oil may help reduce obesity in mice.
  • Obesity Research Some research suggests MCT oils allow the body to generate more energy, which gives dieters more room to eat satisfying proteins.

SlimFast Keto Competitors


How Did SlimFast Keto Start?

SlimFast has been in business since 1977, focusing on SlimFast diet pills, shakes, snacks, prepackaged meals, and other products for managed weight loss. SlimFast also provides meal plans to help consumers attain their health goals.

In 2004 in response to demand for low-carb products, SlimFast first produced the lower-sugar SlimFast Optima line and recently introduced SlimFast Keto products for the needs of a ketogenic diet.


SlimFast Keto Claims

SlimFast Keto products claim to help keep dieters in ketosis. While the official site acknowledges no “magical, quick-fix cure for weight loss,” a low-carbohydrate keto diet such as the SlimFast diet plan can play a significant role in weight loss.

The SlimFast Keto Diet also claims a ketogenic diet will help reduce hunger pangs by suppressing hunger hormones and allowing dieters to eat satisfying foods like steak.


SlimFast Keto Ingredients

SlimFast Keto products include meal replacement shakes, snacks, and dietary supplements. All of the products provide low-carbohydrate, high-fat nutrition.

Some key SlimFast Keto ingredients include:

  • MCT Oil Blend (palm, coconut, grass-fed butter)
  • Protein Blend (whey protein concentrate, whey protein isolate)
  • Grass-Fed Collagen Peptides
  • Cocoa
  • Erythritol


MCT Oil is an oil made of medium-chain triglycerides (MCT) that commonly occurs in coconut oil. MCT oils help raise the fat content of SlimFast Keto products and help promote a feeling of fullness.


Erythritol is a sugar alcohol.


SlimFast Keto products frequently feature a natural sweetener called Stevia. Although stevia is 300 times sweeter than standard sugar, it has a limited caloric impact and has been used in foods in Japan since the 1970s.

According to The Journal of Nutrition, stevia is popular due to it being plant-based, zero calories, and significantly sweeter than sugar.

Whey Protein and Collagen Protein

Whey and collagen protein enable cells to rebuild themselves, which is especially important in conjunction with a healthy exercise program, as the SlimFast diet plan recommends.

Does SlimFast Keto Work?

Any diet or exercise plan has variable results depending on a person’s health and general commitment to the program. However, as the International Journal of Environmental Research and Public Health points out, the ketogenic diet tends to be useful for different reasons:

  • Control of appetite hormones
  • Appetite-suppressant effect of ketones

The SlimFast Keto diet, designed to maintain ketosis, can help dieters achieve these results.

Benefits & Results

SlimFast Keto Benefits and Results

SlimFast Keto results will vary. The products function to put dieters in a state of ketosis. In ketosis, the body uses fat to produce ketones, which are small molecules used for energy.

In short, an essential benefit of the SlimFast Keto diet plan is that your body will burn its own stored fat to power you. The results of a long-term ketogenic diet are unknown.

Details on SlimFast Keto and Weight Loss

An important aspect to understand about this keto diet plan is that dieters replace two daily meals with SlimFast products, including shakes, bars, or cookies, to reduce hunger and maintain the metabolic rate at a higher level.

For optimal weight loss, the SlimFast diet strongly advises dieters to avoid sweetened beverages and sweets in general. SlimFast Keto results depend on keeping sugar and carbs to a minimum.

Weight loss is more likely to occur when dieters keep themselves in a ketogenic state. Sugars or excessive carbohydrates will make the body “switch over” from burning fat to burning the carbs in food. This will cause weight loss to slow down, or more likely, reverse, so you gain weight.


How to Use SlimFast Keto

SlimFast Keto products can be used individually on an as-needed basis by dieters wanting an occasional low-carbohydrate snack or meal replacement shake. Additionally, SlimFast products can form an essential part of an overall health program.

One to two meals a day can are the SlimFast shakes, bars, or snacks. The final meal of the day can follow recipes or suggestions on the SlimFast keto diet program. Ideally, the meal should be higher in healthy fats, adequate in protein, and low in carbohydrates.


How Much Does Slimfast Keto Cost?

The official SlimFast website does not list prices for its items. Is SlimFast Keto on Amazon? Yes, and the products are easy to find. Some representative costs of specific SlimFast Keto products are as follows:

  • Keto Meal Replacement Peanut Butter Fat Bomb: $9.97 per box
  • Keto Meal Replacement Bar: $9.97 per box
  • Keto Meal Replacement Powder Fudge Brownie Batter: $14.23 per canister
  • Keto Creamer: $14.11
  • MCT Oil: $6.98 per bottle
  • Ketone Test Strips: $9.97
  • Keto Fat Bomb: $9.97
Side Effects

Potential SlimFast Keto Side Effects

Potential SlimFast keto side effects can vary. Medical News Today points out that especially if dieters are new to ketosis, they may experience sluggishness, constipation, or low blood sugar.

Other keto dieters experience what is known as “keto flu,” a general feeling of lowered energy as your body adjusts from burning carbs to burning fat. Keto flu is treatable by drinking water with electrolytes.

Pros & Cons

SlimFast Keto Pros and Cons

SlimFast Keto products, if used as part of an overall health management program and regular exercise, may help dieters lose weight. Weight loss in a low-carbohydrate plan usually happens quickly before some degree of plateauing or tapering.

One downside to the SlimFast program may be the limited number of products available through the SlimFast Keto line. As Harvard University states, a low-carbohydrate diet can be challenging to stick to in the long run. Lack of food variety may cause dieters to lose interest.

What Users Are Saying

What Users Are Saying

“At first it was hard to mix, but I gave it a shake it all blended together nicely, I added frozen blueberries and chia seeds with unsweetened almond milk!”

“I’m going to have to seriously doctor up the rest of the canister to make it drinkable…maybe add unsweetened coconut milk and a couple of frozen strawberries. Mixed with water, as per directions, it tastes artificial with a weird texture. The brownie batter flavor was at least drinkable. And only 8g of protein??? Not impressed…”

“The taste is good. I use it as snacks between meals. You may want to eat more than one during one break. I received two packs and most of them were melted before. Still edible though. If not on sale, the cost per pack is a little pricey.”

Bottom Line

Bottom Line on SlimFast Keto

The SlimFast Keto line claims that dieters can lose weight with a minimal amount of hunger pangs or cravings by using SlimFast Keto products as part of an overall weight management plan in combination with exercise.

We’re all for moving toward a healthier life, but sometimes, it can be hard to make those lifestyle changes needed. Luckily, clinically-proven programs exist to make the transition a whole lot easier.

One the best weight-loss apps we’ve seen is one called Noom. Noom provides users with everything they need to start making healthier choices and lose some weight along the way, plus an amazing app so you can access your personalized plan from anywhere.

Dietspotlight readers can now try Noom as part of a free trial offer for a limited time – something you might want to take advantage of!

Learn More About Noom »
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SlimFast Keto

Is Slimfast Keto for weight loss?

Slimfast Keto products support a low carbohydrate, high fat diet for weight loss.

What are the Slimfast Keto ingredients?

MCT Oil Blend, protein blends, cocoa, Erythritol, grass-fed collagen peptides

Are there Slimfast Keto side effects to know about?

Side effects of Slimfast Keto are possible tiredness, constipation, and a lowered sugar level.

Is Slimfast Keto safe?

This product is generally considered safe for men and non-pregnant women over 18.

Where can I buy Slimfast Keto?

Slimfast Keto is available with online shopping, such as Amazon, or most health and supplement stores.

Where can I buy SlimFast Keto?

SlimFast Keto can be purchased using their Official Site.

Is there a Slimfast Keto free trial or free samples?

Currently free trials or samples are unavailable.

What is the most common Slimfast Keto complaint?

There are a limited amount of products available.

What are some similar products to Slimfast Keto?
TruKETO, and Kara Keto Burn are similar products to Slimfast Keto.
Are Slimfast Fat Bombs Keto?

The Slimfast Fat Bombs are keto-friendly.

How many carbs are in SlimFast Keto?

The amount of carbs in Slimfast Keto products will depend on what you choose to consume and in what flavor.. For example, the Slimfast Keto Meal Replacement Mix in Cake Batter contains 5 grams of net carbs.

Is SlimFast Keto actually keto?

Slimfast Keto says it is a good choice for ketogenic diet followers as their products are low-carb and easy to use.

66 SlimFast Keto Reviews

  • Sandra

    Why do the shakes hurt my stomach immediately after drinking?

    • CJ

      Luis – we get it. You can stop saying that to every single person. Why post a review section if you’re going to make the same snarky reply to everyone?

      • CJ

        My point is that you don’t have to keep saying the same thing to each person. Or even responding to them at all. No one is asking you to give anyone any advice. It’s a review section, not a Q&A section. It literally says “Reviews” right above the section. But anyway, the first 2-3 times got the point across just fine.

    • Kelly

      Has anyone after a few days had the pain go away? Is it like the fats abusing to ur body or?? I thought they tasted so damn good, this sucks but anyone have any other keto meal replacement drinks? Not powders but something already ready like this? If so please lmk

  • Never again
    Dana (Verified Purchase)

    I tried keto shakes after a few sips my stomach was burning. Will not use again.

    • Christi

      I had the burning too. was wondering if it’s because I’ve had diverticulitis in the past.

  • Instant side effect. Not worth it for me.
    Anonymous (Verified Purchase)

    I tried a bomb today and 2 hours later was in the bathroom for the rest of the evening intestinally sick!
    Never again!

    • Abigail

      It took just 30 minutes for me and I threw up after taking the Slimfast Keto Shake this morning. Of course I didn’t see this long thread of complaints until after the fact. Will be returning the rest of the package back to the store. Not worth the trouble for me.

  • Nutritive Sweetener?

    Nutritive Sweetener? Is that safe for Keto? No artificial sweeteners should be used while on a Keto diet lifestyle. Is this referring to Stevia?
    Why does this cause constipation? MCT Oil and Collagen cause diarrhea.

    • Lauren

      I’ve tried losing weight with everything else but never could. I’ve finally lost 10 pounds in my first 3 weeks of using these keto products.

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