Best Intermittent Fasting Supplements (2026)

Intermittent fasting can deplete essential nutrients during extended fasting windows, leading to fatigue, headaches, and muscle cramps. The right supplements help maintain electrolyte balance, preserve muscle mass, and support energy levels without breaking your fast. Here are the best supplements specifically designed for intermittent fasting protocols.

Quick Comparison

Product	Key Ingredients	Form	Best For	Rating
Zhou Fast Support	Electrolytes, B12, Creatine, Iodine	Capsules	Best Overall	9.4/10
Nutri-Align Fasting Salts	Sodium, Potassium, Magnesium	Capsules	Best Electrolytes for Fasting	9.3/10
Fast Lyte Fasting Electrolytes	Potassium, Sodium, Magnesium, Trace Minerals	Powder	Best Powder for Extended Fasts	9.2/10
Real Ketones Electrolyte Packets	BHB Ketones, Electrolytes	Powder Packets	Best for Keto Fasting	9.0/10
Enzymedica Fasting Today	Electrolytes, Baobab Fiber, EAAs	Powder	Best All-in-One Fasting Mix	9.0/10
Supersmart Potassium Bicarbonate	5400mg Potassium Bicarbonate	Capsules	Best Potassium Supplement	8.9/10

1. Zhou Fast Support – Best Overall

Zhou Fast Support is purpose-built for intermittent fasting, combining electrolytes, B12 for energy, creatine for muscle preservation, and iodine for thyroid support in one capsule.

Each 2-capsule serving delivers an electrolyte blend of potassium, sodium chloride, and magnesium alongside 200mg of creatine monohydrate, vitamin B12, and 30mcg of iodine. The creatine inclusion is notable because fasting can directly impact muscle maintenance, and creatine monohydrate is the most studied form for preserving lean mass. The iodine addresses thyroid function, which can be affected by caloric restriction. Zero calories and zero sugar mean it won’t break your fast. Made in a GMP-certified facility.

• Pros:
• Multi-targeted formula addressing electrolytes, energy, muscle, and thyroid support
• Zero calories — will not break a fast
• Convenient 2-capsule daily dose

• Cons:
• Creatine dose (200mg) is well below the standard 3-5g clinical dose
• Individual electrolyte amounts are modest

Best for: Intermittent fasters who want a single all-in-one supplement covering multiple fasting needs

2. Nutri-Align Fasting Salts – Best Electrolytes for Fasting

Nutri-Align Fasting Salts are specifically formulated for fasting protocols, delivering pure electrolytes without any fillers, flavors, sugars, or sweeteners that could disrupt autophagy or ketosis.

Each 3-capsule serving provides 655mg sodium, 297mg potassium, and 38mg magnesium using sodium chloride, potassium chloride, and magnesium citrate for optimal absorption. The dosing is fully adjustable — 3 capsules for intermittent fasting, 1-2 for keto maintenance, and up to 24 capsules daily for extended fasting. The product is manufactured in FDA-registered, GMP-accredited facilities and is Halal-certified. No calories, no fillers, and nothing that will break your fast.

• Pros:
• Completely clean — zero fillers, flavors, sugars, or sweeteners
• Flexible dosing for different fasting protocols
• Specifically designed for fasting, not repurposed from sports nutrition

• Cons:
• Requires multiple capsules per serving
• Magnesium dose is relatively low per serving

Best for: Serious intermittent and extended fasters who want pure electrolyte replacement without anything that could break a fast

3. Fast Lyte Fasting Electrolyte Powder – Best Powder for Extended Fasts

Fast Lyte combines three natural mineral sources to deliver a broad-spectrum electrolyte powder with 72+ trace minerals, specifically engineered for fasting protocols.

Each serving provides 1,175mg potassium, 575mg sodium, 100mg magnesium, 25mg calcium, and over 74 trace minerals from Pink Himalayan Salt, marine-sourced magnesium, and a plant-based mineral complex. The unflavored powder can be mixed into water at adjustable ratios depending on fasting duration and intensity. Since 2019, Fast Lyte has been committed to using only natural mineral sources with no fillers or sweeteners. The powder is compatible with keto, vegan, paleo, and carnivore diets.

• Pros:
• High potassium content (1,175mg) — hard to find in most electrolyte supplements
• 72+ trace minerals from three distinct natural sources
• Unflavored and versatile for any beverage

• Cons:
• Salty taste at higher concentrations
• Powder format requires measuring and mixing

Best for: Extended fasters and those who want the highest electrolyte doses from natural mineral sources. For those also following a keto diet, this pairs well with ketogenic protocols.

4. Real Ketones BHB Electrolyte Packets – Best for Keto Fasting

Real Ketones combines patented D-BHB exogenous ketones with a full electrolyte blend, helping your body stay in ketosis while maintaining hydration during fasting windows.

Each packet delivers D-BHB (Beta-Hydroxybutyrate) alongside sodium, potassium, magnesium, and calcium. The exogenous ketones provide an immediate fuel source during fasting, helping to reduce hunger and maintain mental clarity without breaking ketosis. The powder mixes into water with a pleasant flavor and contains no artificial colors or flavors. This is an ideal bridge supplement for those combining intermittent fasting with a ketogenic diet.

• Pros:
• Patented D-BHB ketones for sustained energy during fasting
• Full electrolyte spectrum included
• Helps suppress appetite during fasting windows

• Cons:
• Higher price point than pure electrolyte supplements
• BHB technically contains calories, which may concern strict fasters

Best for: Keto dieters who combine ketogenic eating with intermittent fasting protocols

5. Enzymedica Fasting Today – Best All-in-One Fasting Mix

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Enzymedica Fasting Today is a comprehensive drink mix designed specifically for intermittent fasting, combining electrolytes, essential amino acids, and organic baobab fiber in one scoop.

The formula includes an electrolyte complex (sodium chloride, potassium bicarbonate, magnesium oxide, calcium carbonate), all nine essential amino acids for muscle preservation, and organic wild-harvested baobab fruit for prebiotic fiber support. The tropical pineapple flavor mixes easily with water. The amino acid inclusion is strategic — EAAs help protect lean muscle mass during fasting windows without significantly spiking insulin. Formulated to not break your fast while providing three essential fasting supports in one product.

• Pros:
• Three-in-one formula: electrolytes + amino acids + fiber
• Organic baobab fiber supports gut health during fasting
• Pleasant tropical pineapple flavor

• Cons:
• EAAs may technically trigger a minimal insulin response in very strict fasters
• Only one flavor option

Best for: Fasters who want a comprehensive all-in-one solution covering hydration, muscle support, and gut health

6. Supersmart Potassium Bicarbonate – Best Potassium Supplement

Supersmart delivers a high-dose 5,400mg potassium bicarbonate formula specifically targeting the potassium depletion that commonly occurs during fasting.

Potassium is one of the most commonly depleted electrolytes during fasting, and most electrolyte blends don’t provide enough. This standalone potassium supplement uses potassium bicarbonate, which also helps buffer acidity that can increase during fasting and ketosis. The capsule form contains no calories, sugars, or fillers, making it fully fasting-compatible. Best used alongside a separate sodium and magnesium source for complete electrolyte coverage.

• Pros:
• High-dose potassium rarely found in combination electrolyte products
• Bicarbonate form helps buffer acidity during fasting and ketosis
• Zero calorie capsules won’t break a fast

• Cons:
• Only addresses potassium — need additional supplements for other electrolytes
• Multiple capsules required per serving

Best for: Fasters who need targeted potassium supplementation to complement other electrolyte sources

7. Dr. Berg Electrolyte Capsules – Best Budget Fasting Electrolytes

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Dr. Berg’s electrolyte capsules deliver a broad-spectrum mineral blend at an affordable price point, making them a practical daily option for intermittent fasters.

Each serving provides a balanced blend of potassium, sodium, magnesium, and calcium in capsule form with no sugar, maltodextrin, or artificial ingredients. The 160-capsule bottle provides excellent value and lasts over a month at the recommended daily dose. Originally formulated to complement Dr. Berg’s keto and fasting protocols, these capsules have become a popular standalone electrolyte supplement. The capsule form makes them convenient for use during fasting windows when you don’t want a flavored drink.

• Pros:
• Excellent value with 160 capsules per bottle
• Clean formula with no sugar or maltodextrin
• Well-suited for both keto and fasting protocols

• Cons:
• Capsule form means no hydration boost from a flavored drink
• Some users report needing more than the suggested dose

Best for: Budget-conscious intermittent fasters who want clean electrolyte capsules

8. Keto BHB Salts Capsules – Best BHB Capsules

These BHB salt capsules combine patented goBHB Beta-Hydroxybutyrate with sodium, calcium, and magnesium to support ketosis and electrolyte balance simultaneously.

Each serving delivers BHB salts bonded to sodium, calcium, and magnesium, providing both exogenous ketones and essential minerals in one supplement. The capsule form eliminates the taste issues common with BHB powders and makes dosing simple and consistent. This is a solid option for people who combine intermittent fasting with a ketogenic diet and want ketone support without the bitter flavor of BHB drink mixes. Those looking for more keto electrolyte options can find additional recommendations in our dedicated guide.

• Pros:
• Combines exogenous ketones with electrolyte minerals
• No unpleasant BHB taste — capsule form eliminates flavor issues
• Supports both ketosis and hydration during fasting

• Cons:
• BHB doses are lower in capsules compared to powder forms
• May not provide sufficient standalone electrolyte support

Best for: Keto fasters who want the convenience of BHB ketones and electrolytes in capsule form

How to Choose the Best Intermittent Fasting Supplement

The most important consideration is whether the supplement will break your fast. Look for products with zero calories, zero sugar, and no protein or amino acids if you’re practicing strict fasting for autophagy benefits. Electrolyte capsules and unflavored powders are the safest options. Products containing BHB ketones or amino acids provide benefits but may technically trigger minimal metabolic responses.

Electrolytes should be the foundation of any fasting supplement stack. Sodium, potassium, and magnesium are the three minerals most commonly depleted during fasting. A good fasting electrolyte supplement should provide at least 500mg sodium, 200mg potassium, and 50mg magnesium per daily dose. Many people underestimate potassium needs during fasting, so look for products that specifically address this.

Consider your fasting protocol when selecting products. For 16:8 intermittent fasting, a basic electrolyte supplement is usually sufficient. For longer fasts (20:4, OMAD, or extended fasts), you may need higher doses and additional support like B vitamins for energy, creatine for muscle preservation, or BHB ketones for fuel.

Capsules are generally the cleanest option for fasting since they contain no flavors, sweeteners, or other additives. Powders offer higher doses and the added benefit of encouraging water intake. Choose based on your personal preference and how strict your fasting protocol is.

Frequently Asked Questions

What supplements should I take while intermittent fasting?

Electrolytes (sodium, potassium, magnesium) are the most important supplements during intermittent fasting. Additional options include vitamin D, B vitamins for energy, magnesium for sleep and muscle relaxation, and omega-3 fatty acids (taken during eating windows). Avoid supplements with calories, sugars, or protein during fasting windows if you want to maintain the metabolic benefits of fasting.

Will supplements break my fast?

Calorie-free supplements like pure electrolyte capsules, mineral powders, and most vitamin capsules will not break a fast. Supplements containing sugar, protein, amino acids, or fats can trigger insulin responses and should be taken during eating windows. BHB ketones are a gray area — they contain some calories but are generally considered fasting-compatible for most protocols.

When should I take supplements during intermittent fasting?

Electrolytes can be taken anytime during fasting or eating windows since they contain no calories. Fat-soluble vitamins (A, D, E, K) and omega-3s should be taken with meals for proper absorption. Water-soluble vitamins like B12 can be taken during fasting windows. Magnesium is often best taken in the evening for its relaxation benefits.

How much sodium do I need while fasting?

Most people need 2-3 grams of supplemental sodium per day during fasting, especially in the first few weeks as the body adapts. Common symptoms of sodium depletion during fasting include headaches, fatigue, dizziness, and brain fog. Start with 1-2 grams daily and increase if symptoms persist.

Can intermittent fasting cause electrolyte imbalance?

Yes. Reduced food intake means fewer dietary electrolytes, and increased water consumption during fasting can further dilute mineral levels. Common signs of electrolyte imbalance include muscle cramps, headaches, fatigue, dizziness, and heart palpitations. Supplementing with electrolytes, particularly sodium and potassium, helps prevent these issues.

Should I take a multivitamin while intermittent fasting?

A multivitamin can help fill nutrient gaps caused by a shorter eating window. Take it with your first meal since many vitamins require food for proper absorption. Focus on a high-quality formula that includes vitamin D, B vitamins, magnesium, and zinc, which are commonly under-consumed during fasting protocols.

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