During-effort fuel · electrolyte · reviewed 3 Sep 2026
SiS GO Electrolyte 17
36 g of carbohydrate and 146 kcal a serving make this the only product in the electrolyte category here that doubles as real fuel -- but at $6.25 per 1000 mg of sodium, it's the most expensive electrolyte source in the catalog.
Score breakdown
Each dimension below is scored 0 to 100 against a fixed scale, not against the rest of the catalog, so adding a product never moves this number. The overall score is the average of the dimensions this product declares data for. How the scales are set →
Comparison
6 of 14 electrolytes heldPrices per single sachet at the cheapest box size we track. Best in green, worst in red, across the gels shown.
| Measure | Science in Sport SiS GO Electrolyte | LMNT LMNT Citrus Salt | Nuun Nuun Sport | Precision Fuel & Hydration Precision Fuel & Hydration PH 1000 | Science in Sport SiS GO Hydro | 4Endurance 4Endurance Electrolytes |
|---|---|---|---|---|---|---|
| Overall scoreAn average of the various variables measured. | 17 | 75 | 37 | 36 | 44 | 50 |
| SodiumThe main electrolyte lost in sweat, and the biggest single driver of cramping and hyponatremia risk. | 200 mg | 1000 mg | 300 mg | 500 mg | 345 mg | 250 mg |
| PotassiumWorks alongside sodium in muscle and nerve function. | 60 mg | 200 mg | 150 mg | 130 mg | 65 mg | 70 mg |
| CalciumInvolved in muscle contraction; lost in far smaller amounts than sodium. | 27 mg | 0 mg | 13 mg | 20 mg | 102 mg | 10 mg |
| MagnesiumSupports muscle and nerve function; some evidence it blunts cramping. | 5 mg | 60 mg | 25 mg | 10 mg | 8.1 mg | 50 mg |
| CarbohydrateMinimal by design. This is a hydration product, not a fuel source. | 36 g | 0 g | 4 g | 3 g | 0.9 g | 0 g |
| Price per scoopWhat one scoop costs. | $1.25 | $1.50 | $0.75 | $1.20 | $0.75 | $0.27 |
| Cost per 1000mg sodiumThe only price that compares across different sodium concentrations. | $6.25 | $1.50 | $2.50 | $2.40 | $2.17 | $1.08 |
Verdict
what it does · what it costsWhat it does well
- 36 g of carbohydrate per serving, more than any other electrolyte product in this set, most of which carry 0-4 g.
- All four electrolytes disclosed with real numbers: 200 mg sodium, 60 mg potassium, 27 mg calcium, 5 mg magnesium.
- 146 kcal a scoop means it doubles as light fueling on top of hydration, unlike zero-calorie tablets.
- Mixes into a full 500 ml bottle rather than the 200-300 ml a dissolving tablet typically targets.
What it costs you
- $6.25 per 1000 mg of sodium is the most expensive route to that dose of any electrolyte product in this catalog.
- 200 mg of sodium a serving is modest; several electrolyte products here carry 3-5x more per unit.
- 36 g of carbohydrate a serving means real calories where a pure electrolyte product would have none -- a problem if you're already covering carbs with a separate gel or drink.
Where to buy
Prices and links as last checked. The price next to the name above is per unit at the cheapest box size we track -- a single-unit price below may run higher.
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 hydration and a meaningful carbohydrate top-up in the same bottle without buying a separate energy drink.
- You're already fueling with SiS and want to stay in the GO range rather than mixing brands.
Look elsewhere if
- Cost per milligram of sodium is what matters most to you; several other products here deliver it for a quarter of the price.
- You want a genuinely calorie-free electrolyte source; this isn't one.