Best Electrolyte Tablets for Runners: 10 Options Compared
Ten electrolyte tablets and powders for runners compared by sodium per serving: Nuun, STYRKR, SiS and more, and when to take them.
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The quick answer
Precision Fuel & Hydration PH 1000 is our pick of the electrolyte tablets for runners. One tablet in 500ml gives 500mg of sodium (1,000mg per litre), and the number is in the name. HIGH5 ZERO is the easiest low-cost starting point. PH 1500 is the stronger option for runners who lose a lot of salt, or for preloading before a hot race.
Electrolyte products replace some of the sodium and other minerals lost in sweat. They can be useful on long runs, in warm weather and for runners who finish with salt marks on their kit. They are not a substitute for drinking enough, and they are not automatically needed on every easy hour outside.
How these products were selected
We haven't used everything in this guide and we're not going to pretend we have. Where we've run with something ourselves, the entry says so; where it doesn't, we haven't. The rest are here because they're what UK runners actually buy and the specifications hold up, checked against the manufacturer rather than against other people's lists. Amazon review counts told us what's popular, not what's good.
Check the current packaging before you plan a race around any figure here. Recipes, serving sizes and pack formats change.
Comparison table
| Product | Best for | Sodium per serving | Mix with | Carbohydrate | Format |
|---|---|---|---|---|---|
| Precision Fuel & Hydration PH 1000 | Best overall | 500mg per tablet (1,000mg per litre) | 500ml | Low carbohydrate | Tablet or sachet |
| HIGH5 ZERO | Best value tablets | Not stated on HIGH5’s site: check the tube | 750ml | Zero sugar and calories | Effervescent tablet |
| SiS GO Hydro | Best widely available alternative | Not stated on SiS’s site: check the tube | Check the tube | Zero sugar in standard tablets | Effervescent tablet |
| Precision Fuel & Hydration PH 1500 | Best high-sodium option | 1,500mg per litre | Check the tube | Low carbohydrate | Tablet or sachet |
| SaltStick FastChews | Best without mixing a bottle | 50mg per chew (100mg per 2 chews) | No mixing (maker suggests 2 chews every 30 minutes, with water) | 2g per 2 chews | Chewable tablet |
| Nuun Sport | Best flavour range | 300mg per tablet (maker’s figure) | 16 fl oz (about 475ml) | Very low (1g sugar) | Effervescent tablet |
| OTE Hydro Tabs | Best simple UK endurance tablet | Not stated on OTE’s site: check the tube | Check the tube | Zero or negligible | Effervescent tablet |
| STYRKR SLT07 Hydration Tablets | Best endurance-focused alternative | 500mg or 1,000mg per tablet depending on the version: check the tube | Check the tube | Under 1g | Effervescent tablet |
| Tailwind Rapid Hydration | Best single-serve powder | 320mg per sachet (maker’s figure) | 16–24 fl oz (about 475–710ml) | 12g | Powder sachet |
| Puresport Watermelon Salt | Best strongly flavoured sachet | Not stated on Puresport’s site: check the pack | Check the pack | Low carbohydrate | Powder sachet |
Sodium figures are from each maker’s own website, checked 13 Oct 2026. Where we couldn’t confirm a figure there, the table says so. Labels change, so read the tube you’ve got.
1. Precision Fuel & Hydration PH 1000
Best overall
- Key specification: 1,000mg sodium per litre when mixed as directed
- Practical comparison: Low carbohydrate
- Format: Tablet or sachet
PH 1000 gives runners a clearly labelled sodium concentration and a mild flavour. It is easier to build into a deliberate hydration plan than products that describe themselves simply as “electrolytes” without making the sodium level obvious.
Good for: Long runs, warm races and runners who want a clear sodium target.
Watch out for: A high sodium number is not proof that you personally need that amount. Test concentration and fluid volume together.
2. HIGH5 ZERO
Best value tablets
- Key specification: Moderate electrolyte serving; check current tube
- Practical comparison: Zero sugar and calories
- Format: Effervescent tablet
HIGH5 ZERO is widely available, easy to carry and inexpensive enough for regular training. One tube gives you a simple way to add flavour and electrolytes to water without adding meaningful carbohydrate.
Good for: Everyday training, travel and runners trying electrolyte tablets for the first time.
Watch out for: The sodium content is lower than specialist high-sodium products, so do not assume one tablet matches a heavy sweat loss.
3. SiS GO Hydro
Best widely available alternative
- Key specification: Electrolyte blend with sodium as the main practical comparison
- Practical comparison: Zero sugar in standard tablets
- Format: Effervescent tablet
SiS GO Hydro is another straightforward tablet that is easy to find in the UK. It works well when you want fluid and electrolytes without turning the bottle into a carbohydrate drink.
Good for: Training runs, race drop bags and runners already using SiS fuel.
Watch out for: Some versions contain caffeine. Check the label rather than assuming every tube is the same.
4. Precision Fuel & Hydration PH 1500
Best high-sodium option
- Key specification: 1,500mg sodium per litre when mixed as directed
- Practical comparison: Low carbohydrate
- Format: Tablet or sachet
PH 1500 is designed for higher sodium delivery. It is commonly considered for preloading or by runners with particularly salty sweat, but it should be used as part of a tested plan rather than because the bigger number looks more serious.
Good for: Hot events, preloading and runners with evidence of high sodium losses.
Watch out for: Too much sodium can make a drink unpleasant and does not fix drinking too little or too much.
5. SaltStick FastChews
Best without mixing a bottle
- Key specification: 50mg sodium per chew
- Practical comparison: Very low
- Format: Chewable tablet
SaltStick FastChews let you separate sodium intake from your water and carbohydrate choices. That is useful during races where bottle strength changes at aid stations or when you prefer plain water.
Good for: Ultras, hot races and runners who want small adjustable doses.
Watch out for: Chews make it easy to take salt without matching it to fluid. Keep a simple record of both.
6. Nuun Sport
Best flavour range
- Key specification: 300mg sodium per tablet (maker’s figure)
- Practical comparison: Very low
- Format: Effervescent tablet
Nuun Sport is popular because the flavours are light and the tube is easy to carry. It sits between general hydration tablets and the stronger sodium products aimed specifically at heavy sweaters.
Good for: Long training days, travel and runners who dislike very salty drinks.
Watch out for: Imported flavours and pack formats can make UK pricing inconsistent.
7. OTE Hydro Tabs
Best simple UK endurance tablet
- Key specification: Electrolyte blend for a standard bottle
- Practical comparison: Zero or negligible
- Format: Effervescent tablet
OTE Hydro Tabs are designed around endurance sport rather than general wellness. The flavour is restrained and the tablets can sit alongside OTE gels, chews or carbohydrate drinks without adding another large fuel source.
Good for: Long runs where carbohydrate comes from food, gels or a second bottle.
Watch out for: Check the bottle volume stated on the current tube before comparing sodium with another brand.
8. STYRKR SLT Hydration Tablets
Best endurance-focused alternative
- Key specification: 500mg or 1,000mg sodium per tablet depending on the version: check the tube
- Practical comparison: Low or zero
- Format: Effervescent tablet
STYRKR offers hydration products with clearly named salt strengths. That makes the range worth considering for runners who want to adjust concentration between cool training and hotter race conditions.
Good for: Runners who want more control than one fixed tablet strength.
Watch out for: Similar product names can refer to different sodium levels. Match the exact tube to the plan.
9. Tailwind Rapid Hydration
Best single-serve powder
- Key specification: 320mg sodium, 12g carbohydrate per sachet (maker’s figures)
- Practical comparison: Low carbohydrate
- Format: Powder sachet
Rapid Hydration is convenient when you do not want effervescent tablets breaking up in a race vest. Single-serve sticks are easy to add at checkpoints and make bottle strength more repeatable.
Good for: Race drop bags, travel and runners who prefer powder over tablets.
Watch out for: Do not confuse Rapid Hydration with Tailwind Endurance Fuel or High Carb Fuel, which contain much more carbohydrate.
10. Puresport Watermelon Salt
Best strongly flavoured sachet
- Key specification: High-sodium style hydration sachet; check current serving
- Practical comparison: Low carbohydrate
- Format: Powder sachet
Puresport Watermelon Salt is aimed at runners who want a more obvious flavour and a meaningful salt serving. It can be easier to drink than a nearly neutral mix when plain water becomes unappealing.
Good for: Warm runs, pre-race hydration and runners who prefer sweet watermelon flavour.
Watch out for: Strong flavour can become tiring over several bottles. Test it at full race concentration.
Do trail runners need electrolytes?
Not on every run. Water and ordinary food are often enough for short, cool sessions. Electrolytes become more relevant as duration, heat and sweat loss increase. Sodium is usually the main number worth comparing because it is the electrolyte lost in the greatest quantity through sweat.
When should you take electrolytes on a run?
Before: only if the day calls for it. A stronger drink in the hour or so before a hot race or a long hill day is what products like PH 1500 are sold for. On an ordinary training run, a normal meal with some salt in it does the same job.
During: mostly on longer runs, in warm weather, and if you finish with salt marks on your kit. On a short, cool run, water is usually enough. Drink to thirst rather than forcing it down, and spread the sodium across the run with your drinks, not all at once.
After: usually a meal and a drink cover it. A tablet in your bottle is handy after a hot, sweaty day when food is a while off. If you’re also low on fuel, a recovery drink does more.
Whatever you do, try it in training before you rely on it in a race or out on the hill.
How much sodium should a runner take?
There is no single correct figure. How much you sweat, and how salty that sweat is, varies a lot from one runner to the next and with heat, pace and fitness (Baker, 2017). Start with the manufacturer’s standard concentration, note thirst, stomach comfort and salt marks, then adjust during training. Do not copy another runner’s high-sodium plan just because they are faster or run longer.
More fluid is not always better either. Drinking well beyond thirst on a long event is the main cause of low blood sodium (hyponatraemia), and electrolyte tablets don’t make overdrinking safe (Hew-Butler et al., 2015). If you’ve been told to limit salt, or you have a heart, kidney or blood pressure condition, check with your GP before using high-sodium products.
Electrolytes versus carbohydrate drinks
A zero-calorie tablet mainly changes the electrolyte content and flavour of water. A carbohydrate drink also supplies fuel. Keep those jobs separate in your head so you do not accidentally underfuel by relying on a hydration tablet, or overfuel by combining a strong drink with frequent gels.
How to carry electrolyte products
Tablets are compact but can crumble when bounced around. Keep them in the original tube or a small dry container. Sachets are easier to count in drop bags. Mark high-sodium and caffeinated products clearly so they are not confused in the dark. If you mix by volume, a soft flask with markings makes it easier to get the same strength at every refill.
Frequently asked questions
What are the best electrolyte tablets for runners?
Precision Fuel & Hydration PH 1000, because the sodium is clear: 500mg a tablet in 500ml. HIGH5 ZERO and SiS GO Hydro are simpler lower-cost choices, and they work just as well on trails.
When should I take electrolytes when running?
Mostly during longer runs, hot days and races where you sweat heavily. Some runners take a stronger drink before a hot race. On short, cool runs, water is usually enough. Drink to thirst and test your plan in training first.
Do I need electrolytes after running?
Not usually. A normal meal and a drink replace what most runs take out. After a long, hot day when food is a way off, an electrolyte tablet in water or a recovery drink can bridge the gap.
Can you take too many electrolytes?
Yes. Follow the daily limit on the label, and don’t stack tablets, salt capsules and salty sports drinks without counting the total. Drinking far more than you need is a bigger risk on long events than running short of salt. If you have a medical condition or have been told to limit salt, check with your GP first.
Are electrolyte tablets better than powder?
Neither is inherently better. Tablets are compact and cheap. Powders are easier to portion in race bags and can offer a wider range of sodium strengths.
Can I take electrolytes without carbohydrates?
Yes. Many tablets provide electrolytes with little or no carbohydrate. You will still need a separate fuel plan on longer runs.
Do electrolytes prevent cramp?
Not reliably. Cramp has several possible causes. Sodium and fluid may be part of the picture for some runners, but an electrolyte tablet is not a guaranteed prevention.
Can I use electrolyte tablets every day?
Most runners do not need them every day. Use them when duration, weather, sweat loss or convenience makes them useful, and follow the current label.
Which electrolyte is best for heavy sweaters?
A higher-sodium product such as PH 1500 may be worth testing if you have clear salt marks or measured high sodium loss. More sodium is not automatically better.
Final verdict
PH 1000 is our pick. HIGH5 ZERO is the easiest low-cost starting point, while PH 1500 is the more purposeful option for runners with high sodium losses or for preloading before a hot race.
The right choice depends on the route, weather, duration and the rest of your kit or nutrition plan. Test it before relying on it in a race or remote area.