During-effort fuel · electrolyte · reviewed 26 Aug 2026
4Endurance Electrolytes 50
The lowest sodium dose per tablet in this set at 250 mg, but also the cheapest cost per 1000mg of sodium here once you account for the price.
Score breakdown
The overall score is the average of what's below, each measured against every other electrolyte we've reviewed.
50
Mixed
Sodium dose ?Sodium per serving, on a scale topping out at 1000 mg — a single dose covering the top of what's typically lost to sweat in an hour.25
Value (cost/1000mg Na) ?What it costs to get 1000 mg of sodium from this product. Not physiological -- a market-based scale from $3.00 (0) to $1.00 (100).96
Potassium ?Potassium per serving, on a scale topping out at 200 mg — roughly the upper end of typical hourly sweat loss.35
Calcium ?Calcium per serving. Weaker grounding than sodium/potassium -- sweat calcium loss is minor and not really a primary target during exercise; the 100 mg ceiling is this catalog's practical high end, not a physiological one.10
Magnesium ?Magnesium per serving, on a scale topping out at 60 mg, roughly matching cited hourly sweat-loss ranges.83
Cost per 1000mg sodium
$1.08/1000mg
Sodium per tablet
250mg
Comparison
5 of 11 electrolytes heldPrices per single sachet at the cheapest box size we track. Best in green, worst in red, across the gels shown.
| Measure | 4Endurance 4Endurance Electrolytes | LMNT LMNT Citrus Salt | Nuun Nuun Sport | Precision Fuel & Hydration Precision Fuel & Hydration PH 1000 | Science in Sport SiS GO Hydro |
|
|---|---|---|---|---|---|---|
| SodiumThe main electrolyte lost in sweat, and the biggest single driver of cramping and hyponatremia risk. | 250 mg | 1000 mg | 300 mg | 500 mg | 345 mg | |
| PotassiumWorks alongside sodium in muscle and nerve function. | 70 mg | 200 mg | 150 mg | 130 mg | 65 mg | |
| CalciumInvolved in muscle contraction; lost in far smaller amounts than sodium. | 10 mg | 0 mg | 13 mg | 20 mg | 102 mg | |
| MagnesiumSupports muscle and nerve function; some evidence it blunts cramping. | 50 mg | 60 mg | 25 mg | 10 mg | 8.1 mg | |
| CarbohydrateMinimal by design. This is a hydration product, not a fuel source. | 0 g | 0 g | 4 g | 3 g | 0.9 g | |
| Price per tabletWhat one tablet costs. | $0.27 | $1.50 | $0.75 | $1.20 | $0.75 | |
| Cost per 1000mg sodiumThe only price that compares across different sodium concentrations. | $1.08 | $1.50 | $2.50 | $2.40 | $2.17 |
Verdict
what it does · what it costsWhat it does well
- $1.08 per 1000mg of sodium, the cheapest way to that dose of any product reviewed.
- 50 mg of magnesium, second only to LMNT.
- Zero calories and zero carbohydrate.
What it costs you
- 250 mg of sodium a tablet means four tablets to reach LMNT's single-stick dose.
- Only mixed with a small 200–300 ml of water rather than a full bottle, so you'll need more tablets across a long session.
- Not sold through US retailers; pricing here is converted from EUR and availability will vary.
Where to buy
Prices and links as last checked.
Not yet checked at retail.
Who this is for
the numbers, appliedThe field tells you what it is. This is who should act on it.
Worth the money if
- You want the lowest cost per 1000mg of sodium and don't mind more tablets to get there.
- You want magnesium alongside sodium without paying LMNT's price.
Look elsewhere if
- You want the fewest tablets possible for a given sodium target.
- You need guaranteed US retail availability.