During-effort fuel · gel · reviewed 3 Sep 2026
SiS GO Energy + Electrolyte Gel 20
Same 22 g of carbohydrate as SiS's own GO Isotonic Energy Gel, but with 118 mg of sodium built in -- nearly 30 times the isotonic gel's 4 mg -- for 34 cents more a gel ($2.83 vs $2.49).
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 →
20/100
Weak
Based on 3 of 4 measures ?A dimension a product doesn't declare is left out of its average rather than counted against it -- so this score reflects fewer measures than a product with a full panel.
Carb density ?How much fuel one sachet carries. 90 g is the ceiling here, matching the top of the range cited for multi-transportable-carb intake.24
Value (cost/gram) ?Price of one gram of carbohydrate. Not physiological -- a market-based scale from 15 cents/g (0) to 2 cents/g (100).16
Gut comfort ?A proxy, not a taste or tolerance test: shorter ingredient lists score higher, from 15 ingredients (0) to 1 (100). Nobody has actually run these through anyone's gut for this score.21
Cost per gram of carbohydrate
12.9 cents/g
Glucose : fructose · not disclosed
n/d
Comparison
6 of 38 gels 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 Energy + Electrolyte Gel | Maurten Maurten Gel 100 | Science in Sport SiS Beta Fuel Gel | Precision Fuel & Hydration Precision Fuel PF 30 Gel | NEVERSECOND NEVERSECOND C30 Gel | GU Energy Labs GU Original Energy Gel |
|---|---|---|---|---|---|---|
| Overall scoreAn average of the various variables measured. | 20 | 47 | 58 | 49 | 42 | 33 |
| CarbohydrateHow much fuel one sachet carries. | 22 g | 25 g | 40 g | 30 g | 30 g | 22 g |
| Glucose : fructoseGoverns how fast you absorb it. More fructose, higher ceiling. | n/d | 1 : 0.8 | 1 : 0.77 | 1 : 0.5 | 1 : 0.5 | ~ 1 : 0.47 |
| SodiumAgainst 400 to 1000 mg an hour typically lost in sweat. | 118 mg | 20 mg | 30 mg | not declared | 200 mg | 60 mg |
| ProvenanceWhether that ratio is read off the panel, computed from it, or inferred. | Not disclosed | Stated | Derived | Stated | Stated | Estimated |
| Price per sachetWhat one costs. Not comparable across sachet sizes. | $2.83 | $3.75 | $2.50 | $3.12 | $3.50 | $2.00 |
| Cost per gramThe only price that compares across sachet sizes. | 12.9 cents | 15 cents | 6.3 cents | 10.4 cents | 11.7 cents | 9.1 cents |
| Sachets for 90 g/hrHow many you open an hour to hold a 90 g/hr target. | 4.1 | 3.6 | 2.3 | 3.0 | 3.0 | 4.1 |
Verdict
what it does · what it costsWhat it does well
- 118 mg of sodium a gel, far more than SiS's own GO Isotonic Energy Gel (4 mg) or Beta Fuel Gel (30 mg).
- Rounds out with 9.5 mg potassium and 1.5 mg magnesium, a fuller electrolyte profile than most gels disclose.
- Single-source maltodextrin keeps sugars to about 1 g out of 22 g of carbohydrate.
- Sold in a standard 30-pack at $2.83 a gel, a predictable per-unit cost.
What it costs you
- 22 g of carbohydrate is on the low end for a gel; you'd need over four an hour to hold 90 g/hr.
- No glucose:fructose ratio -- maltodextrin is the only carbohydrate source, so there's no blend to disclose.
- 12.9 cents a gram of carbohydrate is pricier than SiS's own GO Isotonic Energy Gel at 11.3 cents for the same 22 g dose.
- 118 mg of sodium is meaningfully more than 4 mg but still well under a dedicated electrolyte drink's dose -- not a substitute for a real sodium plan in serious heat.
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 sodium built into your gel instead of carrying it separately.
- You're already fueling with SiS GO gels and sweat heavily enough that the plain Isotonic gel's 4 mg of sodium isn't enough.
Look elsewhere if
- You want the cheapest carbohydrate per gram in the SiS GO range; the plain Isotonic gel beats it.
- You already carry sodium in a bottle or tabs and don't need it duplicated in your gel.