Sweat buckets in the gym? Plain H₂O won’t replace the sodium, potassium and magnesium you leak out. I trial-mixed four Amazon UK options—cheap to premium—plus my mate’s favourite sachets.
What I looked for
- ≥ 300 mg sodium plus supporting minerals
- < 4 g sugar (no energy-drink sugar bombs)
- UK/EU GMP manufacturing
- Clear per-serving directions
| Slot | Electrolytes / serve* | Servings | £ / serve (Total item £) | Link |
|---|---|---|---|---|
| Budget – HIGH5 ZERO Tabs (20) | 250 mg Na, 70 mg K, vit C | 20 | £0.22 (£4.31) | Buy on Amazon UK |
| All-Rounder – Bulk Complete Electrolyte Powder 100 g | 4-electrolyte blend; 1 g scoop | 50 | £0.10 (£4.99) | Buy on Amazon UK |
| Premium – Precision Hydration PH 1500 Tabs (4 × 10) | 750 mg Na (makes 500 ml 1500 mg /L) | 40 | £0.93 (£36.99) | Buy on Amazon UK |
| Friend’s Pick – Ancient + Brave True Hydration (15 sachets) | 500 mg Na, coconut water, Mg, Cr | 15 | £1.33 (£19.99) | Buy on Amazon UK |
*Label values; mix strength can vary.
Why they topped my chart
HIGH5 ZERO (Budget) – Sugar-free fizz tablet, light citrus taste. 20 tabs = a month of post-workout bottles for the price of a fancy coffee.
Bulk Powder (All-Rounder) – 1 g scoop disappears in any drink, ultra-cheap per hit, no flavour so you can add squash.
Precision Hydration 1500 (Premium) – Serious sodium for heavy sweaters and marathoners; Informed-Sport certified, effervescent tube is travel-proof.
Ancient + Brave (Friend’s) – Coconut-water base, mild berry taste, chromium for blood-sugar balance; handy single-serve sachets.
7-Day re-hydration protocol
- Right after training: one serve in 500–600 ml water.
- Daily baseline: another serve mid-afternoon on hot days.
- Log weight & energy: if morning weight swings > 1 % or you feel sluggish, bump to stronger mix (PH 1500).
⚠️ Skip if you’re on low-sodium medical diets; talk to your GP for chronic cramps or dizziness.
Transparency
As an Amazon Associate I earn from qualifying purchases (tag markweb05-21). Not medical advice—consult a professional for personal guidelines.