Electrolytes & Hydration: When You Actually Need Them

Electrolyte drinks have gone from niche endurance kit to gym-bag staple, and it's easy to assume you need them every time you break a sweat. The truth is more nuanced. For many sessions, plain water does the job perfectly well; in other situations — particularly prolonged endurance exercise — a carbohydrate–electrolyte drink can be the more practical choice. This guide explains what electrolytes are, when they're worth it, and how to choose the best electrolyte drink for your goals and budget.

What electrolytes actually do

Electrolytes are minerals that carry an electrical charge and play a part in the body's normal fluid balance, nerve function and muscle function. The main ones lost through sweat are sodium, with smaller amounts of potassium, magnesium and chloride. Sodium is lost in the largest quantities, which is why electrolyte formulas built for use around exercise are usually designed around it.

When you sweat heavily over a long session and top up with plain water alone, you replace fluid without replacing the minerals lost in sweat. That's the gap electrolyte products are designed to address, particularly during longer or hotter efforts.

When you actually need them

Here's the honest answer most brands skip: for short, moderate sessions, most people don't need an electrolyte drink at all.

Everyday and shorter workouts

For a typical 45–60 minute gym session in a temperate environment, water is usually enough for a well-fed, well-hydrated person. Eating normal meals replaces the modest mineral losses without any supplement. If you enjoy the taste and it nudges you to drink more, that's a legitimate reason to use one, but you're topping up convenience rather than fixing a deficit.

Longer, hotter or sweatier efforts

Electrolytes start to earn their place when sessions push past roughly 60–90 minutes, when it's hot or humid, or if you're simply a heavy or salty sweater (think white marks on your kit). Endurance athletes, hot-yoga regulars, team-sport players and anyone training twice a day are the clearest candidates. In these scenarios a carbohydrate–electrolyte solution comes into its own: this type of drink can help maintain endurance performance during prolonged endurance exercise and enhance water absorption during exercise.

The same logic applies outside training. On hot travel days, or any time you're sweating heavily, some people prefer an electrolyte drink to plain water — though for everyday hydration, water alongside normal, lightly salted meals covers most people's needs.

What to look for in a good electrolyte product

Once you've decided you need one, the label matters more than the marketing. Broad, evidence-informed pointers:

• Meaningful sodium. Sodium is the main electrolyte lost in sweat, so it's the one worth checking first. Many serves aimed at exercise sit somewhere around 300–700 mg of sodium, and heavy sweaters on long efforts may look higher. A product with only a token amount is closer to flavoured water.
• A sensible mineral blend. Some potassium and magnesium alongside sodium mirrors what you lose in sweat. You don't need megadoses of every mineral under the sun.
• Carbohydrate, if endurance performance is the goal. For prolonged endurance exercise, carbohydrate–electrolyte solutions can help maintain endurance performance and enhance water absorption during exercise; sports-nutrition guidance often points to roughly 30–60 g of carbohydrate per hour from all sources. For everyday sipping, a low- or zero-sugar option is usually the smarter pick.
• Format that fits your routine. Tablets and single-serve sachets are travel-friendly; tubs work out cheaper per serving for regular use.
• Taste you'll actually drink. The formula that works for you is the one you finish, so flavour genuinely counts.

You can compare sodium levels, carbohydrate content and formats side by side across the hydration and electrolytes collection to match a product to how you actually train.

How to choose for your goal and budget

Endurance and long sessions

If you're running, cycling or training long, look for a drink that combines carbohydrate with a solid sodium content. HIGH5 is a well-known endurance-focused name in this space, with hydration and energy drink formats aimed at exactly these longer efforts. Pair it with a plan to sip steadily rather than gulping everything at once.

Everyday hydration and general training

For daily use, hot classes or simply drinking more, a low-calorie electrolyte formula keeps things simple without unnecessary sugar. Applied Nutrition offers hydration-oriented options that slot neatly into a normal gym routine, and many lifters keep a tub alongside their usual protein and creatine from brands such as Optimum Nutrition, USN, PhD or Reflex Nutrition.

Budget-conscious

If value is the priority, larger tubs and multi-serve tablet tubes bring the cost per serving right down. Own-label and value-led ranges from names like Bulk and MyProtein can be a sensible entry point, letting you cover hydration without overspending while you work out how often you genuinely use it.

How to use them sensibly

Start drinking before you're parched, sip throughout rather than downing a bottle in one go, and match intake to the conditions: more on hot, long, sweaty days, less on easy indoor sessions. Rehydration continues after you stop, so a serve with your post-workout meal can help top losses back up. And remember that everyday food, especially anything salted, already supplies plenty of these minerals.

This article is general information for healthy, active adults and isn't medical advice. If you have high blood pressure, kidney concerns, are pregnant, or take medication that affects fluid or mineral balance, check with a qualified healthcare professional before adding electrolyte supplements.

The bottom line

Electrolytes aren't magic and they aren't needed for every workout, but for longer, hotter or sweatier training they're a genuinely useful tool. Focus on real sodium content, a format that fits your routine, and a taste you'll finish, then match the product to your goal and budget. Ready to find yours? Browse the full hydration and electrolytes collection to compare endurance and everyday options in one place and get your hydration dialled in.

A quick note

This article is general information, not medical or nutritional advice. Food supplements are not a substitute for a varied, balanced diet and a healthy lifestyle, and should not be used to prevent or treat any illness. Always read the product label, do your own research, and speak to a qualified doctor, pharmacist or registered nutritionist before starting a new supplement — especially if you are pregnant, breastfeeding, under 18, taking medication or managing a health condition.