The 8 Best Keto Supplements of 2021, According to a Dietitian

And how to choose the right ones, from ingredients to certifications

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Our Top Picks
A high-quality multivitamin without added sugars or inherent carbohydrates.
Coconut oil enhances the ketogenic cycle without breaking the bank.
Magnesium acts as an electrolyte, helping to balance fluid levels and control nerve function and muscle contractions.
Helps to mitigate issues of hyperlipidemia associated with ketogenic diets.
Provides a variety of electrolytes and minerals and can help to prevent dehydration.
Supports optimal wellness, brain health and heart health.
his high-quality, easily digestible product helps to prevent cravings and energy crashes.
A great way to add protein to your diet without any questionable ingredients.

If you’re on the keto diet, you know that staying in the fat-burning (ketogenic) state can be challenging. Finding supplements to treat digestive side effects, promote optimal nutrition, and enhance ketosis can be even harder due to hidden sugars found in many products. Here’s a round-up of the top supplements that will help boost your keto experience without breaking the sensitive cycle.

What to Look for in a Keto Supplement

Sugar and Carbohydrates:

Any supplement you choose must be low in—or free of— sugar and carbohydrates to stay in the sensitive ketogenic state. Take a look at the ingredients and nutrition facts panel to ensure that the supplement does not contain extra sugar or carbohydrates. While products with artificial sweeteners may be "keto-friendly," these products may make cravings worse and heighten digestive issues, so it's best to avoid products with artificial sweeteners.


When selecting a keto supplement, consider the purpose of the supplement. For example, are you experiencing the keto flu? Are you struggling with constipation due to low fiber intake? Do you need an extra boost? Supplementation should always have a purpose, and more is not always better.


Many supplements now have "Keto-Friendly" labels and certifications that make it easy to spot products that may be helpful for keto diets.

How We Select Supplements

Our team works hard to be transparent about why we recommend certain supplements; you can read more about our dietary supplement methodology here

Best Overall: MegaFood Women's One Daily Multivitamin

With a focus on high-fat, low carbohydrate foods, keto diets tend to be low in selenium, zinc, calcium, vitamin D, magnesium and potassium. Most of these nutrients are typically found in carbohydrate-containing foods such as fruits, vegetables, dairy, and whole grains which can interrupt the ketogenic cycle.

A high-quality multivitamin without added sugars or inherent carbohydrates can help to bridge the gap of any nutrients you may be lacking. MegaFood offers great food-derived supplements in convenient one-a-day forms for both men and women. The vitamins and minerals in these products, particularly the selenium, zinc and vitamin D for keto-followers, are high quality and easily absorbed and assimilated by the body. These vitamins help to ensure that you are meeting essential vitamin and mineral needs while remaining in ketosis.

Best Budget: Nutiva Virgin Coconut Oil

Nutiva Coconut Oil

Looking for an easy and inexpensive way to boost your keto diet? The best budget-friendly keto product is coconut oil. High in medium-chain triglycerides (MCTs), coconut oil enhances the ketogenic cycle without breaking the bank. The MCTs in coconut oil are rapidly absorbed and transported to the liver, where they are converted into ketones for energy.

Many supplements for enhancing and supporting the ketogenic cycle are expensive and filled with highly processed ingredients. This unrefined, organic coconut oil contains only one ingredient: organic, cold-pressed virgin coconut oil. Made from fresh coconuts, Nutiva is both non-GMO and USDA organic. It is an incredibly powerful and versatile product that can be used for cooking your favorite keto recipes, for a quick energy boost, or even as a skin moisturizer.

Best Magnesium: Natural Vitality Calm Magnesium Supplement

The ketogenic diet is naturally low in magnesium-rich foods, so a supplement may be helpful to balance this mineral that is involved in various bodily processes including energy production and bone health. In the body, magnesium acts as an electrolyte, helping to balance fluid levels and control nerve function and muscle contractions. It is also a natural relaxant and can be used to treat digestive distress including constipation, which is a very common side effect of the ketogenic diet.

Using an unflavored, sugar-free magnesium supplement can help to replenish the electrolyte level in the body and help keep things moving! The unflavored variety of Natural Vitality Calm comes in a powder form that combines with water to create magnesium citrate. This form of magnesium is highly bioavailable and is easily used by the body. 

Best Fiber: Organic India Psyllium Herbal Powder, Whole Husk Fiber

Typical ketogenic diets are very low in dietary fiber. Adding an unsweetened, natural, and flavor-free product like psyllium husk can help to alleviate keto-related digestive woes including constipation.

Psyllium husk powder is a form of soluble fiber, which attracts water, turning into a gel that helps to alleviate constipation. Psyllium husk may also help to mitigate issues of hyperlipidemia associated with ketogenic diets, as it binds to cholesterol in the body and helps to eliminate it.

Organic India is a high-quality brand of psyllium husk fiber used widely by those following a high-fat, low-carbohydrate ketogenic diet. Many other fiber supplements contain artificial sweeteners, colors, and ingredients. Organic India Psyllium Husk Powder contains only one ingredient: organic whole husk psyllium.

Good to Know

Note that when increasing fiber be sure to increase fluids.

Best Electrolytes: Ultima Replenisher Electrolyte Hydration Powder

Ultima Replenisher

Adopting a ketogenic diet results in increased fluid loss from the body, which depletes electrolytes including sodium, potassium, and magnesium. An electrolyte supplement can be especially helpful during the first few weeks on the diet when the body is adjusting to a lower carb lifestyle. This time is typically when people experience the “keto flu” due to drops in sodium, potassium and magnesium levels.

Ultima Replenisher Electrolyte Powder is a fantastic choice for a sugar-free lemonade drink that will replenish electrolyte levels, support your ketogenic diet, and promote optimal energy levels. Sweetened with stevia, Ultima is a delicious, zero-carb drink that tastes great. It also provides a variety of electrolytes and minerals and can help to prevent dehydration associated with the keto diet.

Best Omega-3: Nordic Naturals Ultimate Omega

Nordic Naturals Ultimate Omega

While keto diets are high in fat, they may not provide enough essential fatty acids including omega-3s. Omega-3 fats are classified as essential fats, as the body can’t make the from scratch and they need to be consumed in the diet from food or supplements. Ultimate Omega provides adequate EPA and DHA to support optimal wellness, brain health and heart health. The fish oil comes in the triglyceride molecular form, which is naturally found in fish. This form is easily absorbed and assimilated in the body.

Nordic Naturals is a highly reputable brand that is third-party purity tested to provide a superior product. Nordic Naturals Ultimate Omega is also environmentally friendly and sustainable. The fish oils are Friend of the Sea certified and sustainably made in a zero-waste facility. 

Best MCT Oil: Bulletproof Brain Octane Oil

Bulletproof Brain Octane C8 MCT Oil

MCTs are naturally produced from the breakdown of fat in the body when carbohydrate intake is low. MCTs are converted into ketones, or fuel, that helps you to stay in the ketogenic fat-burning state.

Supplementing with MCT oil can support your ketogenic diet by providing high-energy fuel. Bulletproof’s Brain Octave Oil is made of 100% caprylic acid from coconut oil. This high-quality, easily digestible product helps to prevent cravings and energy crashes. Typical MCT oil contains lower levels of caprylic acid, is extracted using chemical solvents like hexane, and is produced overseas.

Bulletproof’s Brain Octave oil is made in the USA using an expeller press and is refined only with water, heat, and pressure to provide the highest quality oil possible. This flavorless oil can easily be blended into beverages, drizzled over favorite meals, or used to make salad dressing and sauces. 

Best Protein Powder: Primal Kitchen Collagen Fuel

Primal Kitchen Collagen Peptides, Unflavored

Protein powders are an easy way to boost protein intake and energy while on the keto diet, however, many products contain hidden sugars, carbs, and additives. Choosing an unflavored, sugar-free product, such as Primal Kitchen Collagen Peptides is a great way to add protein to your diet without any questionable ingredients. In fact, there’s only one ingredient: bovine collagen peptides, or collagen from cow bones. One scoop of this flavor-free powder provides 10 grams of highly bioavailable protein. It dissolves quickly and completely to add a protein boost to beverages, soups, and even your favorite savory dishes.

Other low-carb, keto-friendly protein powders are derived from allergen-containing foods such as whey, casein, egg, soy, and pea proteins. This collagen is completely free of gluten, dairy, whey, and soy. Made up of type 1 and 3 collagens, this supplement also supports hair, skin, and nail health.

Final Verdict

To ensure you're not missing any key nutrients while on the keto diet, try MegaFood's Women's (view at Amazon) and Men's One Daily Multivitamins (view at Amazon). If you're looking to boost your keto diet with an MCT oil, try Bulletproof's Brain Octane Oil (view at Amazon).

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