Everything you need to know before you choose one.

Electrolytes are minerals that carry an electrical charge when dissolved in water. The main ones in food, drinks and supplements are sodium, potassium, magnesium, calcium and chloride. Your body uses them in fluid balance, nerve signalling and muscle function, and it loses some of them in sweat and urine.

An “electrolyte product” is simply a drink mix, tablet, powder or ready-to-drink beverage that adds some of these minerals to water — usually alongside flavouring, sweeteners and sometimes sugar or caffeine. Products vary enormously in how much of each mineral they contain, which is exactly why we built a database instead of a top-10 list.

Sources: MedlinePlus — Fluid and electrolyte balance · NIH ODS — Sodium

Sodium is the electrolyte lost in the largest amounts in sweat, and it's the number most people compare first. In our database, sodium per serving ranges from modest amounts to over a gram — a difference that changes the taste and the intended use of a product completely.

Individual needs vary widely with sweat rate, sweat sodium concentration, climate, duration of activity and diet. Higher isn't automatically better; it's simply different. People commonly choose high-sodium products for long, hot or salty-sweat sessions, and lower-sodium products for everyday drinking.

Sources: NIH ODS — Sodium · ACSM — Exercise and fluid replacement

Potassium works alongside sodium in fluid balance and normal nerve and muscle function. It's lost in sweat in much smaller amounts than sodium, and most dietary potassium comes from food rather than drinks.

Electrolyte products differ a lot here: some contain a few hundred milligrams, some contain almost none, and some don't declare it at all. Not declared does not mean zero.

Sources: NIH ODS — Potassium

Magnesium is involved in hundreds of enzyme reactions, including those in normal muscle and nerve function. Sweat losses are small compared with sodium, but magnesium is a common addition to electrolyte formulas — and the form used matters for taste and tolerance.

Amounts per serving in our database vary from a few milligrams to substantially more. Based on the information in our database, you can filter and sort to see the full spread rather than trusting a marketing claim.

Sources: NIH ODS — Magnesium

Calcium is best known for bone health, and it also plays a role in muscle contraction and nerve signalling. It appears in some electrolyte formulas in small amounts, often as calcium citrate, lactate, carbonate or chloride.

Many products don't declare calcium at all. We record that as “Not declared” rather than converting it to zero — a missing number is missing information, not evidence of absence.

Sources: NIH ODS — Calcium

Chloride pairs with sodium in salt and is a major component of the fluid outside your cells. Because it usually arrives together with sodium (as sodium chloride), it's the electrolyte least often listed separately on labels.

When a product declares chloride, we record it. When it doesn't, we mark it as not declared.

Sources: MedlinePlus — Chloride in diet

Minerals can't be added on their own — they come as compounds. “Sodium” in a formula might come from sodium chloride, sodium citrate or sodium bicarbonate. Magnesium might be magnesium citrate, malate, glycinate or oxide. Calcium might be calcium citrate or lactate.

The compound affects taste, acidity and how the drink feels in your stomach, and it's often the real difference between two products with identical mineral numbers. That's why we record the declared source compounds for sodium, potassium, magnesium and calcium, not just the milligrams.

People commonly use electrolyte products during or after prolonged exercise, in hot or humid conditions, during heavy sweating at work, when travelling, when following low-carbohydrate diets, or when a clinician has advised extra fluids and salts.

Needs are individual. If you have a medical condition — particularly involving blood pressure, kidneys or heart — or you're pregnant, talk to a qualified health professional before adding sodium or supplements.

Sources: MedlinePlus — Fluid and electrolyte balance · ACSM — Exercise and fluid replacement

For exercise lasting longer than about an hour, or shorter sessions in heat, sports medicine guidance generally discusses replacing both fluid and sodium, and sometimes carbohydrate for fuel. The right combination depends on duration, intensity, temperature and personal sweat characteristics.

Practically, that means sport-focused products tend to sit higher on sodium, and some include carbohydrate. Products vary; the database lets you see which is which.

Sources: ACSM — Exercise and fluid replacement

Sweat rate and sweat sodium concentration differ substantially between individuals. Some people finish a session with visible salt on their skin and clothing; others barely lose any. Those in the first group often gravitate toward higher-sodium formulas.

We don't diagnose your sweat profile — we just show you the declared numbers so you can match a product to what you already know about yourself.

Sources: ACSM — Exercise and fluid replacement · NIH ODS — Sodium

No — sugar is not required for a drink to contain electrolytes. Carbohydrate is included in some products because it provides fuel during longer or harder exercise, and in small amounts it can help with palatability.

Many people prefer zero-sugar options for everyday use, and health authorities generally recommend limiting free sugars overall. Both categories exist in our database, clearly labelled.

Sources: WHO — Sugars intake guideline · ACSM — Exercise and fluid replacement

Caffeine is a stimulant, not an electrolyte. Some products add it for an energy or performance angle; most contain none. Sensitivity varies, and caffeine late in the day can affect sleep.

We audit caffeine separately and use four states: verified caffeine-free, contains caffeine, no caffeine ingredient declared and caffeine not declared. The last two are not the same as zero.

Sources: FDA — Caffeine and your body

Calories in an electrolyte product come almost entirely from carbohydrate. Zero- and low-calorie mixes use non-nutritive sweeteners instead; sport and endurance products may deliberately contain 40–100+ calories per serving as fuel.

Neither is inherently better. It depends on whether you want fuel or just fluid and minerals.

Sources: FDA — Nutrition labeling

Most formulas are built from a small set of components:

• 🧂Mineral salts

  Sodium chloride, sodium citrate, potassium chloride, magnesium malate, calcium lactate and similar compounds.

• 🍬Sweeteners

  Sugar, dextrose, or non-nutritive sweeteners such as stevia, sucralose or monk fruit.

• 🍋Acids and flavours

  Citric acid, malic acid, natural or artificial flavours.

• 🎨Colours

  Some products use added colours; others use none.

• ⚙️Anti-caking and bulking agents

  Silicon dioxide, maltodextrin, rice hulls — used for powder flow and volume.

• ➕Extras

  Vitamins, amino acids, caffeine or herbal ingredients in some formulas.

How to read the label: check the serving size first (per stick, per scoop or per bottle), then the mineral milligrams, then the ingredient list for the source compounds and sweeteners. Two products can look identical per serving and differ once you account for serving size.

Sources: FDA — Nutrition labeling

This is the single most common way electrolyte comparisons go wrong elsewhere: an undeclared potassium value gets rendered as “0 mg” and the product looks worse — or better — than the label supports.

We don't rank products as “best” overall, because the right choice depends on you. Electrolyte Nerd prioritizes declared, verified information and lets you weigh it yourself. A practical order of questions:

1. 1What are you using it for — long hot sessions, everyday drinking, or fuelling a workout?
2. 2How much sodium do you actually want per serving?
3. 3Do you want sugar and calories as fuel, or zero-sugar?
4. 4Caffeine: yes, no, or verified caffeine-free?
5. 5Any ingredient preferences — sweetener type, added colours, source compounds?
6. 6Then compare the shortlist side by side on the same declared fields.

Compare per serving, and check the serving size. Then look at sodium, potassium, magnesium, calcium and chloride together with their declared source compounds, plus sugar, calories and caffeine. Treat undeclared fields as unknown.

Our comparison tool puts up to five products side by side, groups the fields, and highlights the highest and lowest declared values so differences are obvious in seconds.

Every product in our database is recorded from manufacturer or primary sources — nutrition panels, ingredient lists and official product pages — not marketing copy. Each record carries the date a human last checked it against that source, and a link to the source used.

We don't manufacture or sell electrolytes. Missing values stay missing. Where a value is published as a range, we keep the range rather than picking a convenient number. We read the labels so you don't have to.

This page is general information about product labelling and nutrition, not medical advice, diagnosis or treatment. Individual needs vary. Nothing here is intended to claim that any product prevents, treats or cures any condition. Consult a qualified health professional about your own hydration, sodium intake, supplements or medical conditions.