The best way to take electrolytes depends on why you need them. For most people, the answer is simpler than the supplement industry suggests: drink small amounts consistently rather than large doses at once, match your intake to your actual losses, and get the bulk of your electrolytes from food and beverages spread throughout the day. The specifics shift based on whether you’re exercising, following a low-carb diet, or just trying to stay hydrated in the heat.
Before, During, and After Exercise
Timing matters more than brand. Drink about 400 to 600 mL of fluid (roughly 2 cups) about two hours before exercise to start well-hydrated. During your workout, aim for 150 to 300 mL every 15 to 20 minutes, adjusting based on how much you sweat. The goal is to prevent losing more than 2% of your body weight in fluid, which is the threshold where performance and core temperature regulation start to suffer.
For workouts under 90 minutes, plain water is enough. Your normal meals will replace whatever sodium and potassium you lose in sweat. Once you push past 90 minutes, adding electrolytes to your fluid makes a meaningful difference, both for hydration and for sustaining energy. This is where sports drinks, electrolyte tablets, or packets earn their place.
After a long or intense session, your priority is replacing sodium, since that’s the primary electrolyte lost in sweat. Eating a normal meal with some salt within an hour or two handles this for most people. If you finished a multi-hour effort or exercised heavily in the heat, adding a pinch of salt to your recovery drink or sipping broth can speed the process.
How Much You Actually Need
Physically active adults need more than 1.5 grams of sodium per day, and heavy sweaters can lose upward of 10 grams daily. For potassium, the recommended adequate intake is 4.7 grams per day regardless of activity level, though most people fall short of that through diet alone. These numbers are significantly higher than what sedentary guidelines suggest, and the Institute of Medicine explicitly notes that its standard sodium recommendations don’t apply to highly active individuals.
Most commercial sports drinks contain 35 to 200 mg of sodium per 8-ounce serving. That’s a relatively modest amount. If you’re exercising for several hours or in hot conditions, you may need to supplement beyond what a single bottle provides. Salting your food generously at meals, or adding an electrolyte packet with a higher sodium content, can bridge the gap.
Choosing Between Drinks, Tablets, and Food
Electrolyte products come in three main forms: ready-to-drink beverages, dissolvable tablets or powder packets, and whole foods. Each works, but they suit different situations.
- Sports drinks provide sodium, potassium, and carbohydrates together, which is useful during prolonged exercise when you need fuel alongside hydration. A typical sports drink delivers about 458 mg of sodium and 132 mg of potassium per liter.
- Tablets and powders let you control the concentration. You dissolve them in water and can adjust how strong the mixture is. These are convenient for travel or for people who want electrolytes without the sugar found in most sports drinks.
- Whole foods are the most overlooked option. A banana, a handful of salted nuts, or a cup of broth delivers meaningful electrolytes alongside other nutrients your body needs for absorption.
Coconut water is often marketed as a natural sports drink, but its electrolyte profile is lopsided. It contains roughly 1,420 mg of potassium per liter but only about 448 mg of sodium. That potassium-heavy ratio is the opposite of what you lose in sweat. If you prefer coconut water, adding a pinch of salt brings the balance closer to what your body needs during exercise.
Hypotonic vs. Isotonic Solutions
Not all electrolyte drinks hydrate at the same speed. The concentration of a drink relative to your blood determines how quickly your gut absorbs it. Hypotonic solutions, which are more dilute than your blood, get absorbed faster and are gentler on your stomach during intense exercise. Isotonic solutions match your blood’s concentration and absorb well too, but drinks containing certain sugar combinations can become functionally hypertonic after digestion, which slows absorption.
In practical terms, if you’re doing high-intensity work and your stomach tends to get upset, a more diluted electrolyte drink will be easier to tolerate and hydrate you faster. If you’re at a moderate pace and need the calories, a standard sports drink works fine. You can always dilute a too-sweet sports drink with water to bring it closer to a hypotonic concentration.
Electrolytes on a Ketogenic Diet
Low-carb and ketogenic diets create a unique electrolyte challenge. When you cut carbohydrates sharply, your kidneys excrete more sodium and water, which drags potassium and magnesium along with it. This is the main driver behind “keto flu,” the headaches, fatigue, and muscle cramps many people experience in the first week or two.
The recommended intake on a well-formulated ketogenic diet is 3,000 to 5,000 mg of sodium and 3,000 to 4,000 mg of potassium daily. For magnesium, 300 to 500 mg per day is a reasonable starting point. Rather than obsessively tracking milligrams, a simpler approach is to salt your food liberally, drink 1 to 2 cups of broth or bouillon daily (which adds roughly 2 grams of sodium), and eat at least 5 servings of non-starchy vegetables for potassium. Muscle cramps are the most reliable signal that your magnesium is running low. If they show up, a slow-release magnesium supplement taken daily for 3 to 6 weeks typically resolves them.
Sipping vs. Gulping
How you drink your electrolytes matters almost as much as what’s in them. Drinking large amounts at once can overwhelm your stomach, cause bloating, and actually slow absorption. Small, frequent sips are more effective. During exercise, that means a few mouthfuls every 15 to 20 minutes rather than downing a full bottle at a water station. Throughout the day, spreading your intake across meals and snacks keeps levels steadier than relying on a single high-dose drink.
If you’re using electrolyte packets or tablets, dissolving them in a full water bottle and sipping over an hour or two is more effective than mixing a concentrated dose in a small glass. Your intestines can only absorb so much fluid and sodium at a time, so a steady trickle beats a flood.
When Extra Electrolytes Can Backfire
More is not always better. Excess sodium can cause neurological symptoms ranging from irritability and weakness to, in severe cases, confusion and seizures. The severity depends on how fast levels rise, not just how high they go. Excess potassium is potentially more dangerous: it can cause muscle weakness, and at high levels it disrupts heart rhythm. These extremes are rare from oral supplements alone in healthy people, but the risk increases substantially if your kidneys aren’t functioning normally.
People with chronic kidney disease are especially vulnerable because their kidneys can’t efficiently clear excess potassium or sodium. Certain blood pressure medications also reduce potassium excretion, which means adding a high-potassium supplement on top could push levels into a risky range. If you take medication for blood pressure, heart disease, or kidney conditions, checking with your prescriber before adding electrolyte supplements is a genuinely important step, not a generic disclaimer.
For everyone else, the most common side effect of overdoing electrolyte supplements is simply digestive discomfort: nausea, bloating, or diarrhea. If that happens, dilute the concentration, slow down your drinking pace, or switch to getting more electrolytes from food instead.