Best Electrolyte Drinks in the UK (2026): Ranked by Sodium & Testing
The best electrolyte drink depends on the job — because sodium ranges 1x across these products (55 to 55 mg) and they all look identical on the shelf. We rank by verified sodium per serving, cost per serving (price when checked), and certifications — where the finding is stark: of 1 products, none states a product-level certification, and we found none in a registry. Not sure you even need one? Start with how much you actually need.
Informational summary — not medical advice. If you have high blood pressure, kidney disease, or heart failure, or take diuretics or BP medication, talk to your doctor before adding a high-sodium product.
Ranked by label data, cost per serving, and listed certifications — never commissions.
| Item | Value (mg) |
|---|---|
| Ultima | 55 mg |
The awards
The most sodium per stick (1,000 mg) with zero sugar and 60 mg magnesium. Premium-priced and no certification stated, but no other product we compare delivers more sodium without carbs.
A much lower cost per serving than LMNT, and zero sugar. It has only 55 mg sodium (250 mg potassium, 100 mg magnesium), so it is a daily top-up, not a heavy-sweat drink.
Comparing the two big names? See LMNT vs Liquid I.V. Want the cheapest option?
The certification story (the thing nobody shows you)
Walk the electrolyte aisle and every product promises "clean" hydration. We found no listing for the product we price for Ultima Replenisher (NSF Certified for Sport, Informed Choice). Registries were read between 25 August and 27 October 2026. The registry checks are for the US products. If banned-substance testing matters to you (competitive athletes, anyone drug-tested), check the registry yourself before you buy.
Want the full data table?
This page is the curated buying guide — the picks worth your money. If you want every product's exact sodium, potassium, magnesium, sugar, and cost side by side (plus the WHO ORS reference and a DIY recipe), that lives on Electrolyte Formulas Compared, along with a use-case picker. The complete dataset is also a public CC BY JSON file.
What most people get wrong
"Electrolytes" doesn't mean "enough sodium"
Sodium is the electrolyte you lose most in sweat and the one that drives fluid absorption. A product featuring "electrolytes" on the front but listing under ~100 mg sodium is closer to flavoured water. Check the actual milligrams, not the marketing.
You probably don't need one every day
If you eat a normal diet and exercise under an hour, food and water usually cover it — the usual cases for supplementing are heavy sweating and keto or fasting. We break these down in the dosage guide.
Coconut water is the wrong shape
Coconut water is high in potassium but low in sodium — roughly the opposite of what you lose in sweat — so it's a weak rehydration choice unless it's sodium-fortified.
Frequently asked questions
What is the best electrolyte drink?
It depends on use case. Keto/heavy sweat → LMNT (1,000 mg sodium). Cheapest → Ultima, or DIY.
Are electrolyte drinks third-party tested?
We found no listing for the product we price for Ultima Replenisher (NSF Certified for Sport, Informed Choice). Registries were read between 25 August and 27 October 2026. The registry checks are for the US products.
Is LMNT worth the price?
Its label lists 1,000 mg sodium and zero sugar.
How much sodium should an electrolyte drink have?
Depends on the job: 500–1,000 mg for heavy sweat or keto; 200–300 mg for everyday use; under ~100 mg is basically flavoured water. See the dosage guide for your situation.
Related
- Electrolyte dosage guide — how much sodium you actually need, by situation
- Formulas compared + DIY — pick by use case, or make your own
- LMNT vs Liquid I.V. — the two big brands, head to head
- Best magnesium supplements — most electrolyte drinks are low in magnesium
Sources
- World Health Organization. "Oral Rehydration Salts: Production of the new ORS." WHO, 2006. (245 mOsm/L reduced-osmolarity formula.)
- Baker LB. "Sweating Rate and Sweat Sodium Concentration in Athletes." Sports Med. 2017. PMID: 28332116
- Wright EM, Loo DDF, Hirayama BA. "Biology of human sodium glucose transporters." Physiol Rev. 2011. PMID: 21527736
- Manufacturer Nutrition/Supplement Facts panels for all listed products (cross-checked across two independent label passes) + Amazon pricing from our last price check. Full dataset: /electrolytes/formulas-compared.json (CC BY 4.0).