Fasting—whether intermittent, extended, or time-restricted—depletes key electrolytes and nutrients that the body needs to function optimally. The right supplements can prevent headaches, fatigue, muscle cramps, and brain fog without breaking your fast. Zero-calorie electrolyte formulas, fasting-specific salts, and targeted mineral supplements keep energy stable and make fasting sustainable long-term.
Quick Comparison
Product
Key Ingredient
Form
Best For
Rating
Nutri-Align Fasting Salts
Sodium + Potassium + Magnesium
Capsules
Best Overall
4.5/5
Fast Lyte Fasting Electrolyte Powder
Potassium + Trace Minerals
Powder
Best Powder
4.4/5
Simply Primal WATERFAST Electrolyte Powder
Sodium + Potassium + Calcium
Powder
Best for Extended Fasts
4.3/5
Nutri-Align Fasting Salts Advanced
Sodium + Phosphorus + Magnesium
Capsules
Best Advanced Formula
4.4/5
KEY NUTRIENTS Electrolyte Tablets
6 Essential Electrolytes
Capsules
Best Value
4.4/5
Real Ketones BHB Electrolyte Packets
BHB + Electrolytes
Powder Packets
Best for Keto Fasters
4.2/5
SALTT by Keto Chow Electrolyte Drops
Sodium + Magnesium + Trace Minerals
Liquid Drops
Best Liquid Format
4.3/5
1. Nutri-Align Fasting Salts – Best Overall
Nutri-Align Fasting Salts Fasting Electrolytes, 120 Capsules | Pure Electrolyte Capsules for Fasting – Intermittent & Extended Fasting | Sodium Potassium Magnesium Electrolytes | Sugar & Filler Free
FASTING CAPSULES: Our specially formulated Fasting Salts capsules deliver a powerful combination of 655mg Sodium, 297mg Potassium, and 38mg Magnesium per 3 capsules serving. No more guesswork or having to buy separate products and mix them yourself!
NUTRI-ALIGN FASTING SUPPLEMENTS: our fasting range is designed to support your well-being throughout Extended or Intermittent Fasting. Empowering you to break away from sugar and junk food and progress towards your health and fitness goals as quickly as possible.
PURE FASTING SUPPLEMENT: Our fasting capsules are completely free from all fillers, flavorings, sugars, sweeteners and gluten. Calorie-free so won’t disrupt your autophagy or ketosis. Made with Sodium Chloride, Potassium Chloride and Magnesium Citrate forms of electrolytes for optimal absorption and bio-availability.
120 CAPSULES: Compact easy-to-swallow capsules. 6 capsules are equivalent to 1 scoop of the Fasting Salts powder. Recommended daily dosages: 12-24 capsules per day for Extended Fasting, 3 capsules per day for Intermittent Fasting, 1-2 capsules per day for Keto. See the label for our dosage calculator tool.
QUALITY ASSURANCE: Our FDA-registered manufacturing facilities are accredited with GMP, BS EN ISO 9001 and HACCP Food Safety quality certifications. Nutri-Align Fasting Salts capsules are also Halal-certified.
Nutri-Align Fasting Salts is the gold standard for fasting-specific electrolyte supplementation, delivering precisely calibrated sodium, potassium, and magnesium in zero-calorie capsules that will not break a fast.
Each 3-capsule serving provides 655mg sodium, 297mg potassium, and 38mg magnesium using highly bioavailable forms including magnesium citrate. The formula contains zero fillers, flavors, sugars, sweeteners, or gluten—just pure electrolyte salts. Includes a dosage calculator for intermittent fasting (3 capsules/day), extended fasting (12-24 capsules/day), and keto (1-2 capsules/day). 120 capsules per bottle. GMP-certified, Halal-certified, and FDA-registered manufacturing.
Pros:
Purpose-built for fasting with tiered dosing guide
Zero calories, zero fillers – will not break a fast
Halal-certified with GMP manufacturing
Cons:
Extended fasting requires 12-24 capsules daily
Does not include calcium or phosphorus
Best for: Intermittent and extended fasters who want a pure, no-nonsense electrolyte capsule with precise dosing guidance
2. Fast Lyte Fasting Electrolyte Powder – Best Powder
Fast Lyte Fasting Electrolyte Supplement Powder | No Sugar Unflavored Raw Electrolytes | 25% RDI Magnesium and Potassium with Trace Minerals | Carnivore & Keto Friendly | Sugar Free Fasting Salts
Fasting supplement powder with 1175mg Potassium, 575mg Sodium, 100mg Magnesium, 25mg Calcium, and over 74 trace minerals and co-factors.
High concentration mineral source from naturally occurring minerals to supplement any diet or electrolyte need. No fillers or sweeteners; unflavored, raw mineral powder. Great for Keto, Vegan, Paleo, Carnivore, and Intermittent Fasting diets, and as a general electrolyte supplement
Our updated serving size reflects refined dosing guidance for overall fasting needs, while maintaining the same formula, total product quantity, and value in every bag, as always. Since 2019, Fast Lyte has been committed to making electrolytes from natures most pristine mineral sources.
Now with marine sourced magnesium – Extracted from north Atlantic seawater, more bioactive than other forms of magnesium thanks to its rich mineral matrix containing over 74 trace minerals and co-factors
Our fasting salts now include multimineral support – From plant based red algae, this rich in calcium, magnesium, and trace mineral profile source has been studied for decades with studies showing increases in bone mass density due to its complex and rich mineral composition like that of human bone
Fast Lyte delivers one of the most mineral-dense fasting electrolyte powders on the market, combining high-dose potassium and magnesium with 74+ trace minerals from three distinct natural sources.
Each serving provides 1,175mg potassium, 575mg sodium, 100mg magnesium, 25mg calcium, and over 74 trace minerals from marine-sourced and plant-based sources. The unflavored, raw mineral powder contains no fillers or sweeteners, making it truly fast-friendly. Sources include north Atlantic seawater magnesium, Icelandic red algae calcium, and ancient mineral deposit sodium. The brand has been producing fasting electrolytes since 2019.
Pros:
Exceptional potassium dose (1,175mg per serving)
74+ trace minerals from three natural sources
Zero additives – pure raw mineral powder
Cons:
Salty taste requires mixing strategy (sparkling water + lemon)
Powder may not fully dissolve without vigorous mixing
Best for: Fasters who want maximum mineral density and prefer powder format for flexible dosing. Pairs well with magnesium for sleep during extended fasts.
3. Simply Primal WATERFAST Electrolyte Powder – Best for Extended Fasts
Simply Primal WATERFAST Keto Electrolyte Powder for Fasting and Hydration – Lemon Lime Flavor | Pink Himalayan Salt (Sodium), Potassium, Magnesium, Calcium | Sugar Free, Gluten Free, Soy Free
SPECIALLY FORMULATED FOR LONG TERM FASTING: Key electrolytes in the correct proportions allow the body to remain active and alert during fasting periods. Formulated according to guidelines from US/CA recommended daily values (with fasting in mind) to help you succeed in your fast while being KETO-friendly and contains zero sugar.
SUCCESSFUL FASTING WITH TASTY MEAL: Natural flavors and stevia eases the fasting process by making the drink taste like a meal and more palatable to drink. The great taste of lemon & lime helps you consume more water which is vital during a fast and makes the fasting process more enjoyable. Enjoy this delightful drink and continue to be active while fasting.
HIGH QUALITY INGREDIENTS: Pink Himalayan Sea salt, potassium chloride, magnesium citrate, and calcium citrate are all high-quality ingredients and common supplements found in capsules or powders taken by people across the world. These widely used ingredients offer better absorption and reduce the likelihood of side effects.
SUGGESTED ROUTINE: A 3 day fast followed by 2 days of refeeding is recommended for optimal results. A shorter 1-2 day fast will not require refeeding. Refeeding allows the body to slowly come back from a fasting state and continues the weight loss for a couple more days. Drinking bone broth after a long fast will replenish the body with rich nutrients, good fats, and collagen.
100% USA MADE: 1000mg of Sodium, 1000mg of Potassium, 100mg of Magnesium, and 420mg of Calcium per Serving and tested to be gluten-free and soy-free
Specifically formulated for multi-day water fasting, this electrolyte powder provides the exact proportions needed to maintain energy, alertness, and hydration during extended fasts of 3+ days.
Each serving delivers 1,000mg sodium, 1,000mg potassium, 100mg magnesium, and 420mg calcium using Pink Himalayan salt, potassium chloride, magnesium citrate, and calcium citrate. The lemon-lime flavor uses natural flavors and stevia to make prolonged fasting more palatable. Formulated according to US/CA recommended daily values adjusted for fasting physiology. Made in the USA.
Pros:
Balanced 1:1 sodium-to-potassium ratio for extended fasts
Includes calcium (420mg) often missing from other formulas
Pleasant lemon-lime flavor encourages adequate water intake
Cons:
Contains stevia, which may technically affect some fasting purists
Flavored formula limits mixing versatility
Best for: Multi-day water fasters and those doing 3-5 day fasting protocols who need complete electrolyte support
4. Nutri-Align Fasting Salts Advanced – Best Advanced Formula
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Nutri-Align Fasting Salts Electrolytes Advanced, 120 Capsules | Sodium Potassium Magnesium Phosphorus | Pure Fasting Electrolytes | Sugar Free & Filler Free
ADVANCED FASTING CAPSULES: Our specially formulated Fasting Salts capsules deliver a powerful combination of 555mg Sodium, 297mg Potassium, 79g Phosphorus and 38mg Magnesium per 3 capsules serving. No more guesswork or having to buy separate products and mix them yourself!
NO ADDITIVES, NO FLAVORINGS, NO JUNK. The last thing you need when fasting is chemical junk! Our Fasting Salts contain ZERO flavorings, sugars, sweeteners, gluten or soy. The only ingredients are pure electrolyte salts. Includes a small amount of calcium carbonate (bulking agent to enable machine encapsulation) – also a natural electrolyte salt which will not interfere with your autophagy or ketosis in any way.
TOP-QUALITY SOURCE INGREDIENTS: Our Fasting Salts are made from premium forms of electrolytes for optimal absorption. Advanced formulation includes Magnesium Glycinate which is easier to absorb and less likely to cause any digestive upset.
120 CAPSULES PER PACK: Compact easy-to-swallow capsules. 6 capsules are equivalent to 1 scoop of the Fasting Salts powder. Recommended daily dosages: 12-24 capsules per day for EF, 3 capsules per day for IF, 1-2 capsules per day for Keto. See packaging for more detailed information about dosages.
QUALITY ASSURANCE: Our FDA-registered manufacturing facilities are accredited with GMP, BS EN ISO 9001 and HACCP Food Safety certifications, adhering to strict production quality standards to ensure your supplements are pure and safe. Fasting Salts capsules are also Halal-certified and suitable for vegetarians.
The Advanced version of Nutri-Align’s popular fasting salts adds phosphorus and upgrades to magnesium glycinate for better absorption and gentler digestion during fasts.
Each 3-capsule serving provides 555mg sodium, 297mg potassium, 79mg phosphorus, and 38mg magnesium using magnesium glycinate (more bioavailable and less likely to cause digestive upset than citrate). The addition of phosphorus addresses a common deficiency during extended fasting that basic electrolyte formulas miss. 120 capsules per bottle. Same pure, additive-free formula as the original. GMP and HACCP certified.
Pros:
Magnesium glycinate form for superior absorption
Includes phosphorus – critical but often overlooked fasting mineral
Zero digestive upset risk compared to citrate forms
Cons:
Slightly lower sodium than the original formula
Higher price than the standard version
Best for: Experienced fasters who want an upgraded electrolyte formula with better absorption and more complete mineral coverage
5. KEY NUTRIENTS Electrolyte Tablets – Best Value
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At 200 capsules per bottle with all six essential electrolytes, KEY NUTRIENTS delivers outstanding value for fasters who want complete electrolyte coverage at a fraction of the cost of specialty fasting brands.
Each serving provides calcium, sodium, chloride, phosphorus, potassium, and magnesium—all six essential electrolytes in one capsule. The formula is zero-carb, zero-sugar, keto-friendly, and contains no fillers or artificial ingredients. The veggie capsules are easy to swallow and can be taken with just water. 200 capsules per container. GMO-free.
Pros:
All 6 essential electrolytes in one formula
200 capsules per bottle – excellent cost per serving
Zero carbs, zero sugar, keto and fasting compatible
Cons:
Lower individual mineral doses than fasting-specific brands
Not specifically formulated for fasting protocols
Best for: Budget-conscious intermittent fasters who want broad electrolyte coverage without overspending. For those doing keto alongside fasting, this covers both needs.
6. Real Ketones BHB Electrolyte Packets – Best for Keto Fasters
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Real Ketones BHB Exogenous Ketones Drink Mix Packets Keto Electrolytes Powder Packets No Sugar with 4 Main Fasting Electrolytes Plus Hydrating Patented Keto BHB – 30 Count Variety Pack
Rapid Ketosis Support: Get the best of Hydration powder Keto drinks and Electrolyte packets all in one clean formula that helps you achieve and maintain ketosis with our clinically tested ingredients
Preferred Fuel Source: Replenish your mind and body with 5g of our proprietary exogenous ketones powder with high absorption electrolytes powder no sugar or caffeine for sustainable energy and focus
Cutting Edge Ingredients: Ditch those overcaffeinated rehydration powder packets and unnaturally sweet electrolyte drinks and say hello to our nootropic keto drink mix with clinically proven D-BHB
Unmatched Performance: Enjoy faster ketosis and keto diet support with the help of our proprietary keto powder packets and check out our keto resources including recipes and insightful video content
The Gold Standard: We are proud to be the name behind D-BHB one of the leading energy sources of bio-active fuel among Keto supplements Sugar free electrolyte powder packets and Inmit fasting mixes
For those combining ketogenic eating with fasting protocols, Real Ketones provides exogenous BHB ketones alongside electrolytes to accelerate ketosis entry and maintain energy during fasted states.
Each packet delivers BHB (beta-hydroxybutyrate) exogenous ketones with key electrolytes in convenient single-serve packets. The formula supports faster transition into ketosis, reducing the “keto flu” symptoms that often accompany the early stages of fasting. Available in multiple flavors. Each box contains 30 packets for a full month of daily use.
Pros:
Combines exogenous ketones with electrolytes
Convenient single-serve packets for portability
Accelerates ketosis entry during fasting transitions
Cons:
BHB provides calories that technically break a strict fast
Higher cost per serving than pure electrolyte formulas
Best for: Keto dieters who practice intermittent fasting and want to maintain ketosis while replenishing electrolytes
7. SALTT by Keto Chow Electrolyte Drops – Best Liquid Format
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These concentrated electrolyte drops offer the most convenient and portable way to supplement electrolytes while fasting—just add a few drops to any glass of water.
Each serving provides 125mg sodium, 130mg potassium, 45mg magnesium, and trace minerals sourced from Utah’s Great Salt Lake. The liquid drop format allows precise micro-dosing throughout the day and mixes instantly with no clumping or residue. Unflavored formula works in plain water, sparkling water, or any beverage. Doctor-approved blend. GRAS-certified mineral sources.
Pros:
Ultra-portable liquid format – fits in a pocket
Instant mixing with no clumping or taste
Precise drop-by-drop dosing control
Cons:
Lower electrolyte doses per serving than capsules or powders
Small bottle size requires frequent repurchasing
Best for: Fasters who want a travel-friendly, add-to-anything electrolyte solution with minimal taste impact
8. Dr. Berg Electrolyte Capsules – Best for Intermittent Fasting
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Dr. Berg’s electrolyte capsules are specifically formulated for intermittent fasting and keto protocols, delivering a comprehensive mineral profile without any maltodextrin, sugar, or fast-breaking ingredients.
Each serving delivers potassium, magnesium, sodium, calcium, and chloride in a sugar-free, maltodextrin-free formula designed for daily IF use. The capsule format is ideal for those who prefer to take electrolytes during their fasting window without any flavor or calories. 160 capsules per bottle provides an extended supply for daily intermittent fasters.
Pros:
Large 160-capsule bottle for extended daily use
No maltodextrin – a common hidden ingredient in electrolytes
Doctor-formulated for IF and keto protocols
Cons:
Capsule size may be large for some users
Premium pricing compared to generic electrolyte capsules
Best for: Daily intermittent fasters (16:8 or 18:6 protocols) who want a clean, doctor-formulated electrolyte capsule
How to Choose the Best Supplements While Fasting
The three most critical electrolytes during fasting are sodium, potassium, and magnesium. Sodium is lost rapidly during fasting as insulin levels drop and kidneys excrete more water, leading to headaches and fatigue. Potassium prevents muscle cramps and heart palpitations. Magnesium supports sleep quality, mood stability, and muscle relaxation. Look for formulas that deliver meaningful doses of all three rather than token amounts.
Format preference matters for fasting compliance. Capsules are the simplest option—take them with water and move on. Powders offer higher doses and flexible mixing but may have taste challenges. Liquid drops are the most portable and discreet. For intermittent fasting (16:8), capsules are typically sufficient. For extended fasts (24-72+ hours), powders or high-dose capsule protocols provide the larger mineral amounts needed.
The most important rule: your fasting supplement should not break your fast. Avoid any product containing sugar, maltodextrin, artificial sweeteners (some may trigger insulin), or significant calories. Pure electrolyte salts, unflavored mineral powders, and zero-calorie capsules are safest. Stevia is generally considered fast-friendly by most protocols, but strict autophagy-focused fasters may prefer completely unflavored options.
Dosage varies dramatically by fasting type. Intermittent fasters (16:8) need modest supplementation—standard daily electrolyte doses are usually sufficient. Extended fasters (24-72+ hours) need significantly more, particularly sodium (up to 2,000-3,000mg daily) and potassium (1,000-2,000mg daily). Start with lower doses and increase gradually to avoid digestive upset.
Frequently Asked Questions
Do supplements break a fast?
Pure electrolyte supplements (capsules, unflavored powders, mineral drops) with zero calories do not break a fast. Supplements with sugar, maltodextrin, gummies, or significant calories will break a fast. Most capsule-form vitamins and minerals are fast-safe. Avoid gummy vitamins, collagen powders, and protein supplements during fasting windows as these contain calories.
What electrolytes do I need while fasting?
The three essential electrolytes during fasting are sodium (prevents headaches, dizziness, and fatigue), potassium (prevents muscle cramps, weakness, and heart palpitations), and magnesium (supports sleep, mood, and muscle function). Calcium and phosphorus are also important for extended fasts beyond 48 hours.
When should I take electrolytes during a fast?
Spread electrolyte intake throughout the day rather than taking large doses at once. For intermittent fasting, take electrolytes in the morning or when symptoms like headache or fatigue appear. For extended fasts, take electrolytes 2-3 times daily with water. Taking too many electrolytes at once, particularly sodium and magnesium, can cause digestive upset.
Can I take magnesium while fasting?
Yes, magnesium is one of the most important fasting supplements. Magnesium glycinate and magnesium citrate capsules are calorie-free and will not break a fast. Magnesium helps prevent muscle cramps, supports sleep quality, and reduces the anxiety or restlessness some people experience during fasting. Take 200-400mg daily during fasting periods.
How much sodium do I need during an extended fast?
During extended fasts (24+ hours), most people need 2,000-3,000mg of sodium daily to prevent headaches, dizziness, and fatigue. This is significantly more than the standard dietary recommendation because fasting dramatically increases sodium excretion through the kidneys. Pink Himalayan salt dissolved in water or fasting-specific electrolyte supplements are the easiest delivery methods.
Should I take a multivitamin while fasting?
For intermittent fasting (16:8 or 20:4), a multivitamin is optional—take it during your eating window for best absorption of fat-soluble vitamins. For extended fasts beyond 48 hours, a multivitamin can help prevent micronutrient depletion. Take capsule-form multivitamins rather than gummies, and prioritize electrolytes over multivitamins for immediate fasting support.
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