Compare electrolyte powders, tablets and sachets on the sodium, potassium and magnesium per serving, the sugar and calories, and the cost per serving. Most people replace the salts they lose in sweat through normal food and drink, so we explain when an electrolyte product is useful and what to check on the label.
All amino acids & recovery · Hydration drinks · Endurance · Intra-workout · Carbohydrate powders · Magnesium
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What are electrolytes?
Electrolytes are minerals that carry an electrical charge when dissolved in body fluids, mainly sodium, potassium, chloride and magnesium. You lose some of them, mostly sodium, in sweat.
The authorised health claims list includes "Magnesium contributes to electrolyte balance" and "Potassium contributes to normal muscle function", which can only be used for products that are at least a source of magnesium or potassium. Check the label to see whether a product meets that.
Do you need electrolytes?
For most everyday exercise, no: water and your usual meals are enough. The British Dietetic Association advises you to stay ahead of thirst and, after exercise, to restore hydration to replace water and salts lost in sweat.
Electrolyte products are most often used for long sessions, hot conditions or heavy sweating, when replacing sodium as well as water matters more. They're optional extras.
What do electrolyte drinks do?
Only carbohydrate-electrolyte drinks that meet strict conditions can carry authorised claims. The GB claims list allows "Carbohydrate-electrolyte solutions contribute to the maintenance of endurance performance during prolonged endurance exercise" and "Carbohydrate-electrolyte solutions enhance the absorption of water during physical exercise".
To use either claim, the made-up drink must provide 80 to 350 kcal per litre from carbohydrates (at least 75% of it from high-glycaemic carbohydrates, which raise blood sugar quickly, such as glucose or sucrose), 460 to 1,150mg of sodium per litre and an osmolality (a measure of how concentrated the drink is) of 200 to 330 mOsm/kg. Most sugar-free electrolyte tablets don't meet these conditions, so these claims don't apply to them.
Electrolyte powder or tablets?
Choose the format that suits how you'll use it, then compare what's in each serving. Effervescent tablets are easy to carry; powders and sachets often contain carbohydrate as well as electrolytes.
| Type | Typically contains | What to check |
|---|---|---|
| Sugar-free tablets or powder | Electrolytes, sweeteners | Sodium per serving, water volume |
| Carbohydrate-electrolyte powder | Electrolytes, sugars or maltodextrin | Sugar, calories and sodium per litre |
| EAA or creatine + electrolytes | Electrolytes plus other actives | How much of each ingredient |
| Single minerals (potassium, magnesium) | One electrolyte | Amount per daily dose |
How much salt and sugar is in an electrolyte drink?
It varies a lot, so check the label. The NHS says adults should have no more than 6g of salt a day (about a level teaspoon), and no more than 30g of free sugars a day; sugars added to drinks count as free sugars.
Labels may show sodium rather than salt, and the sodium figure is smaller: multiply sodium by 2.5 to get salt. The NHS guide to food labels, for example, counts more than 1.5g of salt per 100g (or 0.6g sodium) as high. Add the salt from electrolyte drinks to what you eat, particularly if you've been advised to reduce salt.
Can you drink electrolytes every day?
You can, but most people don't need to, and daily use adds salt and, in some products, sugar. If you're not sweating heavily, water is usually enough.
If you have high blood pressure, kidney or heart problems, or you've been told to limit salt or potassium, speak to your GP or pharmacist before using electrolyte products. Signs of dehydration, such as dark yellow, strong-smelling pee, headache and feeling light-headed, are listed by the NHS along with when to get help.
Do electrolyte products contain caffeine?
Some do, so check before you buy. A few products in this collection are pre-workouts or energy formulas with electrolytes added. EFSA says single doses of up to 200mg and up to 400mg of caffeine a day do not raise safety concerns for healthy adults, and up to 200mg a day in pregnancy.
If you train in the evening or are sensitive to caffeine, look for a caffeine-free product and check the label.
How to compare value
How to compare value (example figures, not real products): a £7 tube of 20 effervescent tablets costs 35p a serving. A £25 tub of powder with 50 servings costs 50p a serving but provides carbohydrate as well, so compare the sodium per serving and whether you want the sugar before deciding which is better value for you.
"We think customers should compare the actual amount of active ingredients they're getting, rather than just the format or marketing," says Andy Arshad, who runs SupplementHQ. Our guide to reading a supplement label explains where to find the amounts.
Which is the best electrolyte powder or tablet?
The best one for you gives the amount of each electrolyte clearly, suits how long and hard you train, and has a salt and sugar content you're happy with. Bigger numbers aren't automatically better.
Browse the rest of our amino acids & recovery range.
We sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is general information for adults, not personalised medical advice. Food supplements should not replace a varied, balanced diet.
Written by Andy Arshad, SupplementHQ. Last reviewed 11 October 2026.