During-effort fuel · gel · reviewed 26 Aug 2026

SiS Beta Fuel Gel 58

Item: SiS Beta Fuel Gel
Rating: 58
Author: Lourenço Faria e Maia

Science in Sport / 60 ml sachet / 40 g carbohydrate / $2.50

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

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 →

58/100

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

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).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

6.3 cents/g

Glucose : fructose · derived

1:0.77

Comparison

5 of 38 gels 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 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
Overall scoreAn average of the various variables measured.	58	47	49	42	33
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.	6.3 cents	15 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.	2.3	3.6	3.0	3.0	4.1

Verdict

what it does · what it costs

What 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.
6.3 cents 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. 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 $21.99 6-pack 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

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.