Best Electrolytes UK 2026: 5 Hydration Picks Reviewed

Electrolytes are the minerals (sodium, potassium, magnesium and chloride) that your body loses through sweat, and topping them up can help you avoid the flat, crampy feeling that comes with heavy training or a hot day. The market is crowded though, and a lot of products lean on flashy marketing rather than a sensible dose. We pulled together the most popular electrolyte powders, tablets and hydration sachets sold in the UK and compared them on sodium content, taste, ingredients and price. Here are our five picks for 2026.

1. SiS Hydro Electrolyte Tablets: Best Overall

SiS Hydro is our pick for most people. Each effervescent tablet drops into 500ml of water and delivers around 345mg of sodium plus potassium, magnesium, calcium and chloride, with no sugar and added B vitamins. It is Informed Sport approved, which matters if you compete and need to avoid banned substances, and it is one of the easier brands to find in UK shops and online. Owners consistently praise the taste across the berry, lemon and tropical flavours, with few complaints about the chalky aftertaste that plagues some rivals.

The honest downside is that a tube of 20 tablets at roughly £7 is not the cheapest per serving, and the sodium dose, while solid for everyday training, is modest if you are a very heavy sweater on a long ride. For gym sessions, runs up to a couple of hours and general hot-weather hydration, it hits the sweet spot of dose, taste and value.

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2. Precision Hydration PH 1000: Best for Long Endurance

If you sweat buckets or you are out for hours, Precision Hydration PH 1000 is built for you. These powder sachets are formulated to deliver 1000mg of sodium per litre, which is roughly two to three times the salt of a standard tablet and far closer to what endurance athletes actually lose in sweat. The formula skips artificial flavours and sweeteners, it is made in the UK, and it is batch-tested against the WADA banned list, so triathletes and marathon runners trust it.

The trade-offs are price and intensity. Per serving it costs noticeably more than a high-street tablet, and the strong, salty taste is aimed at performance rather than casual sipping, so it can feel like too much for a gentle gym session. Buy it for the long, hot, sweaty efforts it was designed for, not for everyday desk hydration.

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3. HIGH5 ZERO Electrolyte Tablets: Best Value

HIGH5 ZERO is the budget-friendly tablet that keeps coming up in UK reviews, and for good reason. A tube of 20 is often among the cheapest on the shelf, it is zero calories and sugar-free, and it adds vitamin C on top of the core electrolytes. The flavours are well liked, with berry, citrus and tropical all getting the nod, and the tablets dissolve cleanly in a bottle.

The catch is the sodium. At roughly 200mg per tablet it sits at the lower end, so if you are chasing serious salt replacement you may want to use two tablets in a larger bottle, which eats into the cost saving. For light to moderate exercise, day-to-day hydration and anyone watching the pennies, it is genuinely hard to beat on price.

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4. Phizz Electrolytes, Multivitamin & Hydration: Best All-Rounder

Phizz takes a different angle by combining electrolytes with a full multivitamin in one effervescent tablet. You get the four main electrolytes plus 18 vitamins and minerals, including a big hit of vitamin C, which makes it handy if you want hydration and a daily top-up in a single glass. It is vegan, Informed Sport approved and batch-tested, and owners tend to use it as much for travel, busy days and post-night-out recovery as for training.

Because it is built as a daily wellness drink rather than a pure performance product, the electrolyte dose is moderate rather than high, so dedicated endurance athletes will still want something saltier for long efforts. But as a do-everything tablet for general health and light exercise, it offers the most in one tube.

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5. Nuun Sport Electrolyte Tablets: Best for Everyday Hydration

Nuun Sport is the easy-drinking option for people who just want their water to do a bit more. Each tablet carries five electrolytes (300mg sodium, 150mg potassium, plus magnesium, calcium and chloride) and only about 1g of sugar, sweetened with stevia. The flavours are light and refreshing rather than intense, which is exactly why a lot of people sip it all day rather than only during workouts, and the mixed-flavour tubes let you avoid getting bored.

The downside, as with HIGH5, is that 300mg of sodium is on the low side for hard, sweaty endurance work, so serious athletes often double up. For desk days, walks, light gym sessions and warm weather, though, it is one of the most pleasant electrolyte drinks to actually finish.

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Which electrolytes should you buy?

The right choice depends on how hard and how long you sweat. Here is the quick summary:

• Best overall: SiS Hydro is the all-rounder we would point most people to, with a sensible 345mg sodium dose, good taste and Informed Sport approval.
• Best for long endurance: Precision Hydration PH 1000 delivers the high sodium that marathoners, triathletes and heavy sweaters actually need.
• Best value: HIGH5 ZERO does the job cheaply for everyday and light training use.
• Best all-rounder: Phizz bundles a multivitamin in, which suits travel and general health.
• Best for everyday hydration: Nuun Sport is the most pleasant to sip through the day.

For short, gentle sessions, remember that plain water is usually fine. Electrolytes come into their own when you are training hard, going long, sweating heavily or dealing with the heat. Treat them as a hydration aid alongside good everyday eating, not a replacement for it.

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