Electrolytes for keto

Electrolytes For Keto

Cutting carbs drops insulin, and insulin is what tells your kidneys to hold onto sodium — so keto needs 3,000–5,000 mg of sodium a day, several times general guidelines. LMNT's unflavoured stick is $64.95 for a 30-stick box, and everything here ships free over $149.

Shop keto electrolytes See the FAQs

What actually happens on keto

Insulin is the hormone that tells your kidneys to hold onto sodium — cut carbs hard enough and that signal drops to a new, permanently lower baseline.

  • 01

    Insulin drops, and stays down

    Carbs are what keep insulin elevated day to day. Cut them hard enough, consistently enough, and insulin settles at a new, lower baseline.

  • 02

    Kidneys stop holding onto sodium

    Lower insulin means more sodium — and the water bound to it — leaves in the urine. This is most of what sits behind the first week's "keto flu."

  • 03

    Potassium and magnesium go with it

    Both are lost faster through urine, while cutting high-carb foods like fruit, grains and starchy veg removes two of their biggest dietary sources at the same time.

  • 04

    The deficit doesn't end after week one

    Once ketosis is established, elevated sodium excretion continues for as long as carbs stay low — an ongoing target, not a one-off top-up.

Daily mineral targets on keto

Ranges follow Volek & Phinney's guidance for a well-formulated ketogenic diet, contrasted against the NHMRC's general nutrient reference values. General information for healthy adults, not medical advice.

  • Sodium 3,000–5,000 mg Several times the NHMRC's general adequate intake of 460–920 mg — keto's insulin-driven excretion is the reason for the gap.
  • Potassium 3,000–4,000 mg Above the general NHMRC target, to offset both higher urinary losses and lower intake from cut carb sources like fruit and grains.
  • Magnesium 300–500 mg Broadly in line with general RDIs, but worth treating as a floor rather than a ceiling given magnesium's role in keto-related cramping.

Suggested for keto

Picked for a high sodium dose per serve and nothing that has to be checked against a strict carb count.

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  • Keto friendlyZero or near-zero net carbs
  • No hidden sugarsNo maltodextrin, dextrose or fruit solids
  • Full mineral trioSodium, potassium and magnesium together
  • Train keto-adaptedSodium ready before a fasted or low-carb session

What a signal usually reflects

Not a diagnosis — a guide to which mineral is most likely running low during "keto flu," and why.

SignalLikely mineralWhy it happens
Headache in the first few daysSodiumCoincides with the sharp rise in sodium excretion as insulin drops over the first 48–72 hours of carb restriction.
Fatigue or brain fogSodium & potassiumTracks with lower blood volume and the loss of two minerals central to nerve signalling, both moving together early on.
Muscle cramps, especially calvesMagnesiumMagnesium is involved in muscle relaxation, and the plant foods that normally supply it are cut back hardest on a stricter keto plan.
Noticeable or irregular heartbeatPotassiumPotassium plays a role in heart rhythm, and urinary losses continue for as long as insulin stays low.
ConstipationMagnesiumConsistent with reduced magnesium and fibre intake as high-carb plant foods are removed from the plate.

General physiological information, not a diagnosis. If a signal is severe, persistent, or you take blood pressure, heart or kidney medication, speak with a GP before increasing sodium intake.

The first two weeks

A typical adaptation curve — indicative only, not a measured value, and it varies person to person.

  • 0–72 hWater weight dropsGlycogen releases roughly 3g of water per gram, so the scale move in the first three days is mostly fluid, not fat.
  • Day 2–4Peak keto fluSodium excretion is at its highest against near-zero replacement from food — the classic headache and fatigue window.
  • Day 5–10Electrolytes catch upConsistent salting starts closing the gap — most people report symptoms easing once intake matches losses.
  • Week 2+New baselineSodium handling resets around the lower-insulin normal — ongoing intake stays necessary, not just a first-week fix.

Sodium per serve, compared

Label values per serve as supplied by each brand. A keto target of 3,000–5,000 mg sodium is hard to reach with a sports drink and impossible with coconut water.

  • LMNT (1 stick) 1,000 mg
  • Re-Lyte (1 scoop) 810 mg
  • Concentrated mineral drops (1 dose) 380 mg
  • Sports drink (600 mL) 250 mg
  • Coconut water (250 mL) 60 mg

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Three quick questions, one recommendation

Answer three questions about how you do keto and we'll point you at a pick to start with. Prefer the full version? Take the complete quiz.

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I'm happy to be buying my LMNT electrolytes from LYTES. My subscription is easy to manage and adjust as my needs change. I appreciate the free shipping on my large orders.

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Keto and electrolytes, answered

Why do I need more electrolytes on keto specifically?

Lower carbohydrate intake lowers insulin, and insulin is the hormone that tells your kidneys to retain sodium — with less of it, more sodium (and potassium and magnesium alongside it) leaves in the urine. Food alone rarely replaces what's lost, which is why keto dieters typically need to add electrolytes deliberately.

How much sodium should I have on keto?

Volek and Phinney's guidance for a well-formulated ketogenic diet suggests 3,000–5,000 mg of sodium a day, several times the NHMRC's general adequate intake of 460–920 mg for people not restricting carbohydrates.

What is "keto flu" and how long does it last?

"Keto flu" is the informal name for the headaches, fatigue and brain fog some people get in the first few days of keto, largely explained by the sharp rise in sodium excretion as insulin drops. It typically eases within one to two weeks once electrolyte intake catches up with losses.

Will electrolytes kick me out of ketosis?

Unflavoured, zero-carbohydrate electrolyte products contain no carbs to affect ketosis. If you're tracking strict macros and prefer a flavoured product, check the label for any carbohydrate-containing sweeteners first.

Can I get enough electrolytes from food alone on keto?

Salting food generously and drinking bone broth both help, but consistently reaching 3,000–5,000 mg of sodium from keto-compliant food alone is difficult for most people without supplementing directly.

What's the difference between the Keto and Sugar Free collections?

There's a lot of overlap — most products in this Keto collection are also sugar-free — but this collection is curated specifically around the brands and formats keto dieters use most, while Sugar Free is a broader range not limited to keto shoppers.

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