Best Electrolyte Supplements for Fasting in 2026

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If you’ve ever felt dizzy, shaky, or mentally foggy during a fast, there’s a good chance your electrolytes are out of balance. After testing eight of the most popular electrolyte supplements during everything from 16-hour intermittent fasts to 72-hour water fasts, I can tell you: not all electrolyte products are created equal.

Some are glorified sugar water disguised as “hydration.” Others are designed by biochemists who actually understand what your body needs during a prolonged fast. I tested each supplement for taste, ingredient quality, value, and — most importantly — how I actually felt while using them.

Here are the best electrolyte supplements for fasting in 2026, ranked from best overall to last place.

Why Electrolytes Matter During a Fast

When you stop eating, your insulin drops and your kidneys start flushing out water and electrolytes — particularly sodium, potassium, and magnesium. This is why many people feel terrible during the first 24-48 hours of an extended fast. It’s not hunger. It’s electrolyte depletion.

The three electrolytes you absolutely need during fasting:

Sodium (2,000-4,000mg/day during fasting) — maintains blood pressure, prevents headaches and dizziness
Potassium (3,000-4,000mg/day) — prevents muscle cramps and heart palpitations
Magnesium (300-500mg/day) — prevents cramps, supports sleep, reduces anxiety

A good fasting electrolyte supplement should contain meaningful amounts of all three. If a product only gives you 100mg of potassium, it’s basically useless for extended fasting.

1. LMNT Electrolyte Drink Mix — Best Overall

Price: ~$45 for 30 packets | Sodium: 1,000mg | Potassium: 200mg | Magnesium: 60mg

LMNT is the gold standard for fasting electrolytes, and for good reason. Each packet delivers a massive 1,000mg of sodium — exactly what you need during an extended fast. The formula was designed by Robb Wolf and the team at LMNT specifically for people who are low-carb, fasting, or doing keto.

Pros: Zero sugar, zero carbs, no artificial ingredients. Comes in 11 flavors (my favorites are Citrus Salt and Watermelon Salt). Dissolves instantly in water. The sodium dose is genuinely therapeutic — you feel the difference within 30 minutes.

Cons: Expensive at $1.50 per packet. Potassium dose could be higher (200mg vs the 3,000+mg you need daily). Some flavors are polarizing (the Chocolate Salt is… divisive). You’ll likely need to supplement potassium separately for longer fasts.

Verdict: If you can only buy one electrolyte product for fasting, this is it. The sodium content alone makes it worth the price. I use this for every fast over 24 hours.

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2. Dr. Berg’s Electrolyte Powder — Best Value

Price: ~$30 for 30 servings | Sodium: 500mg | Potassium: 1,000mg | Magnesium: 30mg

Dr. Berg’s electrolyte powder is a sleeper pick. While LMNT focuses on sodium, Dr. Berg’s formula delivers a full 1,000mg of potassium per serving — which is exactly what most fasters are missing. It’s designed by Dr. Eric Berg, a chiropractor who’s built a massive following in the keto and fasting space.

Pros: Exceptional potassium content. Affordable. Tastes decent (the Lemonade flavor is solid). Includes trace minerals. Good for people who already get enough sodium from food or salt but need more potassium.

Cons: Sodium dose is lower than LMNT (500mg vs 1,000mg). Magnesium content is minimal at 30mg. The sweetener (stevia) is strong and some people find it off-putting. Mixes a bit chalky.

Verdict: Best value for potassium supplementation. If you’re doing intermittent fasting (16:8 or 20:4) and just need a gentle electrolyte boost, this is the one. Pair it with LMNT for extended fasts.

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3. Normalyte Pure — Best for Extended Fasts (48+ Hours)

Price: ~$30 for 30 packets | Sodium: 1,000mg | Potassium: 200mg | Magnesium: 0mg

Normalyte was originally developed for people with POTS (Postural Orthostatic Tachycardia Syndrome) and dysautonomia — conditions where electrolyte balance is literally life-or-death. That medical pedigree shows in the formulation. Each packet delivers a clean 1,000mg of sodium with zero sugar and zero artificial anything.

Pros: Medical-grade quality. Clean ingredient list. The unflavored version is literally just salt, potassium, and flavor — nothing else. Dissolves completely. Recommended by multiple functional medicine doctors for extended fasting.

Cons: Unflavored tastes like… well, salt water (because it basically is). The flavored versions are better but still not “tasty.” No magnesium — you’ll need to supplement separately. Harder to find in stores (mostly online).

Verdict: If you’re doing 48+ hour fasts regularly, Normalyte is the most reliable option. The medical-grade quality gives me confidence that I’m getting exactly what the label says. I keep these stocked alongside LMNT.

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4. Keto K1000 Electrolyte Powder — Best for Keto + Fasting

Price: ~$25 for 30 servings | Sodium: 500mg | Potassium: 1,000mg | Magnesium: 100mg

If you’re combining fasting with a ketogenic diet (which many people do), Keto K1000 is purpose-built for that crossover. It has the highest magnesium content of any powder I tested at 100mg, and the 1,000mg potassium rivals Dr. Berg’s.

Pros: Best magnesium content of any powder supplement. Strong potassium dose. Affordable. Great flavor options (the Raspberry Lemonade is my go-to). No sugar, no carbs, no fillers.

Cons: Sodium is only 500mg — not enough for extended fasts. The “1000” in the name refers to potassium, not sodium, which trips some people up. Can be slightly gritty if you don’t mix it well.

Verdict: Excellent all-around electrolyte powder for intermittent fasting and 24-hour fasts. The magnesium advantage is real — most fasting electrolyte products skimp on it. Add salt for longer fasts.

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5. SaltStick Caps — Best Capsule Option

Price: ~$30 for 100 capsules | Sodium: 215mg | Potassium: 63mg | Magnesium: 115mg | Calcium: 22mg

Some people just don’t want to drink flavored salt water all day. Fair enough. SaltStick Caps deliver electrolytes in a capsule form that you can take with water. Originally designed for endurance athletes (marathoners, triathletes), they’ve become popular in the fasting community.

Pros: No taste — just swallow with water. Balanced electrolyte ratio. Includes calcium, which most powders skip. Easy to carry in your pocket. No sugar, no sweeteners, no flavors.

Cons: You need to take 3-5 capsules to get a meaningful dose. That’s a lot of pills. Sodium dose per capsule is low (215mg) so you’d need 10+ capsules for a proper fasting dose. Expensive if you’re taking 5+ per day.

Verdict: Best for people who hate the taste of electrolyte drinks or want something portable for work/travel. I keep a bottle in my bag for emergencies, but it’s not my primary electrolyte source during a fast.

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6. Liquid IV Hydration Multiplier — Most Popular (But Not Best for Fasting)

Price: ~$25 for 16 packets | Sodium: 500mg | Potassium: 370mg | Magnesium: 0mg

Liquid IV is the most recognizable name in electrolyte drinks, largely thanks to aggressive marketing and celebrity endorsements. It uses “Cellular Transport Technology” (which is essentially just the right ratio of sodium and glucose to maximize water absorption). But here’s the problem for fasters: each packet contains 11 grams of sugar.

Pros: Actually tastes good — the flavors are genuinely enjoyable. Wide availability (Target, Walmart, grocery stores). The sodium-glucose absorption trick does work. Decent potassium at 370mg.

Cons: 11 grams of sugar per packet will break your fast. Seriously. If you’re fasting for autophagy or insulin control, Liquid IV is not your friend. No magnesium. Most expensive per serving when you factor in the smaller quantity. Marketing over substance.

Verdict: Fine for rehydrating after a workout or during a cold. Not recommended for fasting — the sugar content defeats the purpose. Use LMNT or Normalyte instead.

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7. Key Nutrients Electrolyte Recovery Plus — Budget Pick

Price: ~$20 for 30 servings | Sodium: 500mg | Potassium: 1,000mg | Magnesium: 100mg

Key Nutrients is the budget champion. At under $0.70 per serving, it delivers respectable electrolyte levels across the board. The formula is similar to Keto K1000 but at a lower price point.

Pros: Cheapest option per serving. Good potassium (1,000mg) and magnesium (100mg). Multiple flavor options. Contains 12 vitamins and minerals beyond the big three electrolytes. Zero sugar.

Cons: Taste is “fine” but not great — some flavors taste artificial. Mixability is inconsistent (some batches clump). Sodium is only 500mg. Lower brand recognition means fewer reviews to gauge quality control.

Verdict: If budget is your primary concern, Key Nutrients gets the job done. It won’t win any taste tests, but it delivers real electrolytes at a price that won’t break the bank. Good starter option if you’re new to electrolyte supplementation during fasting.

8. Snake Juice (DIY) — The Hardcore Option

Price: ~$5 for a month’s supply | Sodium: ~2,000mg | Potassium: ~1,000mg | Magnesium: ~300mg

Snake Juice is the fasting community’s original DIY electrolyte drink, popularized by Cole Robinson’s Snake Diet. The recipe is simple: potassium chloride (NoSalt), sodium chloride (sea salt), sodium bicarbonate (baking soda), and magnesium sulfate (Epsom salts — food grade). Mix it in water and drink throughout your fast.

Pros: Insanely cheap. You control the exact ratios. Contains everything you need. Can be customized to your taste. The hardcore fasting community swears by it.

Cons: Tastes absolutely terrible — like drinking a chemistry experiment. Requires measuring and mixing. Food-grade Epsom salt can be hard to find. Easy to mess up the ratios (too much baking soda = nausea). No convenient grab-and-go option.

Verdict: If you’re on a tight budget and don’t mind the taste, Snake Juice works. But honestly, for $30-45/month, LMNT or Normalyte are worth the convenience. Life’s too short to drink salty baking soda water when better options exist.

My Fasting Electrolyte Strategy

After testing all eight supplements, here’s what I actually use:

16:8 Intermittent Fasting: I usually don’t need supplemental electrolytes. Just salt on my food during my eating window.
24-hour fasts: One LMNT packet in the morning, one Dr. Berg’s in the afternoon.
48-72 hour fasts: LMNT + Normalyte alternating throughout the day, plus a magnesium supplement before bed.
72+ hour fasts: All of the above, plus bone broth for the first and last day for additional minerals.

The key insight I’ve learned: sodium is the most important electrolyte during fasting, and most supplements don’t give you enough. If you only buy one product, make it LMNT or Normalyte — the 1,000mg sodium dose is what actually makes a difference.

Frequently Asked Questions

Do electrolytes break a fast?

No. Pure electrolytes — sodium, potassium, and magnesium — do not trigger an insulin response and will not break your fast. They contain zero calories. However, some electrolyte drinks (like Liquid IV) contain sugar, which will break a fast. Always check the label for added sugars.

How much sodium do I need during a 72-hour fast?

Most people need 3,000-5,000mg of sodium per day during an extended fast. That’s roughly 1.5-2.5 teaspoons of salt. If you’re active, sweating, or drinking a lot of water, you’ll need even more. Symptoms of low sodium include headaches, dizziness, brain fog, and fatigue.

Can I just drink broth instead of taking electrolyte supplements?

Yes, bone broth is an excellent natural source of sodium and trace minerals. Many experienced fasters use bone broth for their first and last day of an extended fast. However, broth alone may not provide enough potassium or magnesium, so pairing it with a supplement is ideal.

What’s the best electrolyte supplement for OMAD?

For OMAD (One Meal A Day), you probably don’t need a dedicated electrolyte supplement if you’re eating a nutrient-dense meal. However, if you feel lightheaded or get headaches in the afternoon, a half-dose of LMNT or Dr. Berg’s can help bridge the gap until your meal.

Should I start electrolytes before or during my fast?

Start during. Your body won’t need extra electrolytes until insulin drops and your kidneys begin flushing minerals — which happens 12-16 hours into a fast. Taking electrolytes before you start fasting is unnecessary and wasteful.

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