During-effort fuel · electrolyte · reviewed 26 Aug 2026

SiS GO Hydro 44

Item: SiS GO Hydro
Rating: 44
Author: Lourenço Faria e Maia

Science in Sport / 1 tablet in 500 ml water / 345 mg sodium / $0.75

102 mg of calcium a tablet, about double any other product here, alongside a moderate 345 mg of sodium, at $2.17 per 1000mg of sodium.

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 →

44/100

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.35

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).41

Potassium ?Potassium per serving, on a scale topping out at 200 mg, roughly the upper end of typical hourly sweat loss.33

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.100

Magnesium ?Magnesium per serving, on a scale topping out at 60 mg, roughly matching cited hourly sweat-loss ranges.13

Cost per 1000mg sodium

$2.17/1000mg

Sodium per tablet

345mg

Comparison

5 of 14 electrolytes held

Prices 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 Hydro	LMNT LMNT Citrus Salt	Nuun Nuun Sport	Precision Fuel & Hydration Precision Fuel & Hydration PH 1000	4Endurance 4Endurance Electrolytes
Overall scoreAn average of the various variables measured.	44	75	37	36	50
SodiumThe main electrolyte lost in sweat, and the biggest single driver of cramping and hyponatremia risk.	345 mg	1000 mg	300 mg	500 mg	250 mg
PotassiumWorks alongside sodium in muscle and nerve function.	65 mg	200 mg	150 mg	130 mg	70 mg
CalciumInvolved in muscle contraction; lost in far smaller amounts than sodium.	102 mg	0 mg	13 mg	20 mg	10 mg
MagnesiumSupports muscle and nerve function; some evidence it blunts cramping.	8.1 mg	60 mg	25 mg	10 mg	50 mg
CarbohydrateMinimal by design. This is a hydration product, not a fuel source.	0.9 g	0 g	4 g	3 g	0 g
Price per tabletWhat one tablet costs.	$0.75	$1.50	$0.75	$1.20	$0.27
Cost per 1000mg sodiumThe only price that compares across different sodium concentrations.	$2.17	$1.50	$2.50	$2.40	$1.08

Verdict

what it does · what it costs

What it does well

102 mg of calcium, the highest of any electrolyte product reviewed, about double Skratch Unsweetened Hydration's 50 mg.
345 mg of sodium at a reasonable $2.17 per 1000mg.
Sold in tubes of 20, like High5 Zero.

What it costs you

Only 65 mg of potassium, the lowest of the tablets that declare it.
Fortified with B-vitamins (riboflavin, thiamin, B6) that add ingredients without changing the core electrolyte profile.
US retail pricing for this product is harder to pin down than the US-native brands here.

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.

Science in Sport $14.99 tube of 20 Visit →

Who this is for

the numbers, applied

The field tells you what it is. This is who should act on it.

Worth the money if

Calcium specifically is a priority for you alongside sodium.
You want a large tube size at a moderate per-dose price.

Look elsewhere if

Potassium is the electrolyte you're most trying to replace.
You want the single cheapest cost per 1000mg of sodium in this set.