During-effort fuel · gel · reviewed 26 Aug 2026
SiS Beta Fuel Gel 47
40 g a sachet at a ratio indistinguishable from Maurten's, for a third of the price per gram. On the numbers, the cheapest way to hold 90 g/hr.
Score breakdown
The overall score is the average of what's below, each measured against every other gel we've reviewed.
47
Mixed
Absorption rate ?How much carbohydrate an hour the glucose-to-fructose blend can move. Scored from the stated or derived ratio (1:0.8 tops out this scale); an Estimated ratio counts the same as a Stated one here.93
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.44
Sodium ?Sodium carried by the gel itself, on a scale topping out at 1000 mg — the upper end of what's typically lost to sweat in an hour.3
Value (cost/gram) ?Price of one gram of carbohydrate. Not physiological -- a market-based scale from $0.15/g (0) to $0.02/g (100).67
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.29
Cost per gram of carbohydrate
$0.063/g
Glucose : fructose · derived
1:0.77
Comparison
5 of 22 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 Beta Fuel Gel | Maurten Maurten Gel 100 | Precision Fuel & Hydration Precision Fuel PF 30 Gel | NEVERSECOND NEVERSECOND C30 Gel | GU Energy Labs GU Original Energy Gel |
|
|---|---|---|---|---|---|---|
| CarbohydrateHow much fuel one sachet carries. | 40 g | 25 g | 30 g | 30 g | 22 g | |
| Glucose : fructoseGoverns how fast you absorb it. More fructose, higher ceiling. | 1 : 0.77 | 1 : 0.8 | 1 : 0.5 | 1 : 0.5 | ~ 1 : 0.47 | |
| SodiumAgainst 400 to 1000 mg an hour typically lost in sweat. | 30 mg | 20 mg | not declared | 200 mg | 60 mg | |
| ProvenanceWhether that ratio is read off the panel, computed from it, or inferred. | Derived | Stated | Stated | Stated | Estimated | |
| Price per sachetWhat one costs. Not comparable across sachet sizes. | $2.50 | $3.75 | $3.12 | $3.50 | $2.00 | |
| Cost per gramThe only price that compares across sachet sizes. | $0.063 | $0.150 | $0.104 | $0.117 | $0.091 | |
| Sachets for 90 g/hrHow many you open an hour to hold a 90 g/hr target. | 2.3 | 3.6 | 3.0 | 3.0 | 4.1 |
Verdict
what it does · what it costsWhat it does well
- 40 g per sachet, the highest we have measured.
- 1:0.77 by computation from the declared percentages.
- Declares ingredient percentages on pack.
- $0.063 per gram of carbohydrate. Nothing else here is close.
What it costs you
- Thick and sweet at 40 g in 60 ml.
- Eleven ingredients including two preservatives and two gums.
- 30 mg of sodium is not meaningful at any intake rate.
- The ratio has to be derived rather than read.
Where to buy
Prices and links as last checked.
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 are fuelling long and want the lowest cost per gram.
- You have trained your gut on concentrated gels.
- You already carry sodium separately.
Look elsewhere if
- You struggle with thick textures late in long races.
- You want the shortest possible ingredient list.
- You need the gel itself to carry your sodium.