Water keeps you hydrated, but electrolytes — sodium, potassium, and magnesium — decide where that water goes in your body. This guide explains when plain water is enough, when you need electrolytes, and how to make a simple homemade electrolyte drink.
What electrolytes do
Electrolytes are minerals that carry an electric charge. They help your body absorb water into cells, keep nerves firing, and keep muscles contracting smoothly. You lose them mainly through sweat and urine — and the harder or longer you sweat, the more you lose.
- Sodium: the main electrolyte lost in sweat; helps the body hold onto water.
- Potassium: supports muscle function and fluid balance inside cells.
- Magnesium: involved in muscle relaxation and energy production.
- Calcium: plays a role in muscle contraction and nerve signaling.
When water is not enough
For everyday life and workouts under an hour, plain water is all you need. Reach for electrolytes when:
- You exercise for more than 60–90 minutes.
- You sweat heavily or exercise in heat (see our summer heat calculator).
- You are recovering from vomiting, diarrhea, or a stomach bug.
- Your sweat stings your eyes or leaves white salt marks on clothing.
- You feel headachy or crampy despite drinking plenty of water.
Simple homemade electrolyte drink
You do not need expensive sports drinks. This basic recipe covers the essentials:
- 1 liter (about 4 cups) of water
- 1/4 teaspoon of fine sea salt (sodium)
- 2 tablespoons of honey or maple syrup (quick energy)
- Juice of 1 lemon or lime (flavor + a little potassium)
- Optional: 1/4 cup of orange juice or coconut water for extra potassium
Stir until the salt and honey dissolve, chill, and drink within 24 hours. Adjust the salt down if it tastes too salty — it should taste only lightly seasoned.
Store-bought options: what to look for
- Check the sodium: a useful sports drink has at least 200–300 mg of sodium per serving.
- Watch the sugar: many commercial drinks are closer to soda than science — 6–8% carbohydrate is plenty.
- Skip the hype: fancy added vitamins rarely matter for hydration.
- Tablets and powders: a convenient, low-sugar middle ground for workouts.
Use them wisely
- Do not overdo it: more electrolytes are not better, and excess sodium raises blood pressure.
- Alternate with plain water on long sessions rather than drinking only sports drinks.
- Coconut water is trendy but relatively low in sodium — add a pinch of salt for workouts.
- People with kidney disease, heart conditions, or on sodium-restricted diets should talk to a doctor first.
For information only — not medical advice.