The practical side of electrolytes
If you have read why keto drains your minerals, this is the how-to that follows. The companion guide, Electrolytes and Keto Flu 101, covers the mechanism and the whole foods that prevent the keto flu. This article is about the supplement aisle: which forms actually absorb, how much to aim for, when to take them, and where the real cautions are. No brands, no products to push, just the categories and the honest trade-offs.
Three minerals do the work: sodium, potassium, and magnesium. They are not interchangeable, and they are not all best handled the same way. Sodium is mostly a kitchen problem, potassium is mostly a food problem, and magnesium is the one where a supplement earns its place. Take them in that order.
Sodium: just use salt
Sodium is the mineral you lose most on keto, and it is the cheapest to fix. Plain table salt and sea salt are the same thing for this purpose: sodium chloride. Sea salt brings trace minerals and a different texture, but do not pay a premium expecting a meaningful electrolyte upgrade. The difference is flavor, not function. Skip the idea that you need a fancy mineral salt to do this right.
Most keto sources suggest roughly 3,000 to 5,000mg of sodium a day, which is about 1.5 to 2.5 teaspoons of salt spread across food, broth, and the occasional pinch in a glass of water. A cup of salted broth is one of the easiest ways to land a big chunk of it. The one firm caution: if you have high blood pressure, kidney disease, or a heart condition, set your sodium target with your doctor rather than reaching for the upper end on your own.
Potassium: food first, supplements with care
Potassium is where people most often go wrong by reaching for a pill. Whole foods are the safe and effective source. A medium avocado carries around 700mg, and leafy greens, salmon, mushrooms, and zucchini all contribute. A common daily target is in the range of 3,000 to 4,700mg, and a few potassium-rich foods get most people close. You can look up specific amounts in the keto food database.
Over-the-counter potassium supplements are deliberately capped at small doses, and that is a safety feature, not a flaw. Too much potassium at once can affect heart rhythm, which is exactly why large single doses are restricted. Potassium chloride is the common form, found in supplements and in salt substitutes that swap some sodium for potassium. If you genuinely think food is not enough, that is a question for your doctor, particularly if you take blood pressure or heart medication, where extra potassium can interact.
Magnesium: where a supplement makes sense
Magnesium is the mineral hardest to get from keto-friendly food in full amounts, so this is where a supplement most often helps. Form matters more than for any other electrolyte. Magnesium glycinate is gentle on the stomach and a popular pick. Magnesium citrate absorbs well too, though larger doses can loosen your stool, which some people use on purpose and others want to avoid. Magnesium oxide is the cheap one you will see everywhere, but it is poorly absorbed, so a lot of it simply passes through.
Total magnesium from food and supplements of roughly 300 to 500mg a day is the usual range. Keep the supplement itself at or below 350mg of elemental magnesium a day, the NIH upper limit for supplemental magnesium in adults, and skip it unless your doctor agrees if you have kidney disease. Read the label carefully, since the elemental amount is usually smaller than the total compound weight listed on the front. Splitting the dose and taking it with food reduces stomach upset, and many people take it in the evening because it can support relaxation and sleep.
DIY drink versus commercial powders
You can cover all three minerals without buying anything special. A simple homemade electrolyte drink is water with a measured pinch of salt for sodium, a squeeze of lemon or lime for taste, and your magnesium taken alongside, with potassium coming from your meals. Some people add a small amount of a potassium-based salt substitute. It costs pennies and you control every milligram.
Commercial sugar-free electrolyte powders are the convenient alternative. They hand you a measured dose in one scoop, which is genuinely easier and often tastes better, but you pay for that convenience and the actual mineral amounts vary a lot between products. If you go this route, check the milligrams of sodium, potassium, and magnesium on the label rather than trusting the marketing, and make sure it is truly sugar-free. The Electrolyte Calculator gives you target numbers to check any product or recipe against.
Timing and safety
Spread your electrolytes through the day instead of front-loading them. A practical rhythm is some sodium in the morning, more around workouts when you sweat the most, and magnesium with your evening meal. If brain fog or a cramp hits, a pinch of salt in water often takes the edge off within the hour. Drink to thirst rather than flooding plain water, since overdrinking can wash out the very sodium you are trying to keep.
The honest safety summary is short. Sodium is flexible for most healthy people but not for those with blood pressure, kidney, or heart issues. Potassium supplements should stay small unless a doctor says otherwise. Magnesium is generally well tolerated, though very high doses cause digestive upset and can be a problem with kidney disease. If you have any medical condition or take medication, treat these targets as a starting point to discuss with your clinician, not a prescription. Getting electrolytes right is the single biggest lever for feeling good on keto, and it is also the one worth being sensible about.