Beta Fuel
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The Beta Fuel range earns consistent 9/10 verdicts from independent reviewers for race-day use, with its 1:0.8 maltodextrin-to-fructose ratio delivering genuine GI comfort at high carbohydrate loads — but a near-zero sodium formulation in the powder is a recurring red flag that no serious reviewer ignores.
- Carbohydrate delivery: 80g per drink serving and 40g per gel are among the highest in class, with road.cc's Cat 2 racer and a sport nutritionist both confirming two gels per hour digest without issue on race efforts.
- Taste and palatability: BikeRadar rated the orange flavour the best-tasting high-carb drink tested in 2026; Cycling Weekly notes the sweetness edges toward sickly at higher concentrations, and a registered sport nutritionist gave the strawberry-lime gel just 1.5/5 for flavour.
- Sodium problem: Multiple independent reviewers — including a sport scientist/dietitian duo and an MSc-registered sports nutritionist — flag the Beta Fuel 80 powder's ~10mg sodium per serving as a meaningful safety and performance gap, requiring a separate electrolyte product. The Electrolyte Gel variant (200mg sodium) partially addresses this.
- Value: At ~£2.50/serving for the powder and ~£2/gel, reviewers across road.cc, Cyclingnews, and BikeRadar unanimously recommend reserving it for race days, not training. It undercuts Maurten on price but isn't cheap.
- Nootropics gel: The evidence for citicoline and theanine additives is assessed as limited by two independent nutrition specialists; caffeine and taurine components are well-supported.
Skip if: you want a single all-in-one endurance drink that covers both carbohydrates and electrolytes without buying additional products — the powder's near-zero sodium makes it incomplete on its own.
- performance
Does SiS Beta Fuel actually reduce GI issues compared to standard gels and drinks?
Yes, across multiple independent reviews, the 1:0.8 maltodextrin-to-fructose ratio consistently produced no GI issues even at 80–120g carbs/hour — a meaningful improvement over the older 2:1 formula. The underlying 2013 study (O'Brien et al.) found lower nausea and stomach fullness with the 1:0.8 ratio, and real-world testers at road.cc, BikeRadar, and Cycling News all reported no stomach problems. 45
- known issues
Is the Beta Fuel powder drink safe to use without adding extra electrolytes?
No — the current Beta Fuel 80 powder contains only ~10mg of sodium per serving, which is essentially zero. Multiple independent reviewers (a sport scientist/dietitian duo and a sports nutritionist) flag this as a serious concern, recommending you add table salt, SiS Hydro tablets, or a salt capsule separately. For rides long enough to need 80–120g carbs/hour, you likely need 300–1,000mg of sodium/hour.
- vs. competitors
How does SiS Beta Fuel compare to Maurten in price and carb content?
Beta Fuel is meaningfully cheaper than Maurten and delivers more carbs per product. Beta Fuel gels cost ~£2.00 each with 40g carbs, versus Maurten gels at ~£2.60–£3.00 with only 25g carbs. The Beta Fuel powder (~£2.50/serving) also undercuts Maurten Drink Mix 320 (~£2.86/serving). Both use the same 1:0.8 carbohydrate ratio. 4
- value · price
What does Beta Fuel cost per serving, and is it worth it for training vs. racing?
The powder costs £2.50–£2.75/sachet (£37–£37.50 for 15); gels run ~£2/gel (£12 for 6). Multiple independent reviewers agree it's too expensive for everyday training but worth it for races and hard events where performance matters most. Discounts can reduce the powder to ~£1.67/serving via third-party retailers. 45
- use case
What does Beta Fuel taste like, and does the sweetness become a problem on long rides?
Reviewers disagree slightly: BikeRadar called the orange powder 'by far the best-tasting high-carb drink tested,' and the road.cc long-term reviewer found both orange and lemon/lime 'subtle and easy to get on with.' However, Cycling Weekly warned the solution gets 'a little syrupy' above 120g/750ml, and a sports nutritionist reviewer gave the strawberry-lime gel only 1.5/5 stars for its artificial taste and lingering stickiness. 4
- components
Is the science behind the 1:0.8 carbohydrate ratio solid, or is it mostly marketing?
The ratio improvement is real but the evidence base is narrow. The performance claims trace back to a single 2013 study (O'Brien et al.) on male cyclists showing 17% better carb oxidation and reduced GI symptoms vs. the older 2:1 ratio. Multiple independent reviewers acknowledge the science is legitimate, but flag that it rests on one study with limited participants. The 'pH neutral' and 'isotonic' marketing claims are called out by a sport scientist as buzzwords. 5
- known issues
Are the Beta Fuel gels hard to open mid-ride, and is the packaging an issue?
Yes — multiple reviewers flag the gel's rip-off tab as genuinely difficult to open mid-race. The practical fix most recommend is pre-cutting the tab with scissors before you head out. The powder sachets are easy to travel with but generate more packaging waste than tub formats.
- use case
Is Beta Fuel suitable for competitive or tested athletes worried about doping?
Yes — the entire SiS Beta Fuel range is batch-tested under the Informed Sport programme, meaning every batch is screened against the WADA banned substances list. This is consistently highlighted as a key advantage by multiple independent reviewers and the brand itself.
What reviewers actually said
SiS Beta Fuel 80 is the cycling rocket fuel that powered Chris Froome's 80km-solo stage victory in the 2018 Giro d'Italia, according to the brand.
Beta Fuel uses a ratio of 1:0.8, essentially increasing the percentage of fructose. In doing this, SIS has also increased the amount of carbs per gel to a fairly-potent-by-comparison 40g.
SiS Beta Fuel is ranked 4th, categorized as 'Best for sweet teeth', with the note: 'Both flavours are very tasty'.
The Beta Fuel gels contain roughly 40-50 per cent more carbohydrate and calories than similarly sized gels, and that means you can carry a hell of a lot less.
The SIS Beta Fuel manages to squeeze 80g of stomach-friendly carbs into a 500ml bottle. The 2:1 ratio maltodextrin:fructose solution allows you to process a bottle per hour, allowing an intake of 240g of carbs within a three-hour race.
They made the product better in terms of the glucose and fructose contribution closer to that 1:1 but they made the product less holistically optimal for training by getting rid of the sodium.
Science in Sport has launched a full range of Beta Fuel endurance nutrition products with a new 1:0.8 ratio of maltodextrin to fructose and claims it's 'the most complete and innovative fuelling solution on the market'.
Science in Sport created this new range with a multidiscipline to fructose ratio of one to naught point eight because it was shown to be superior for performance compared to the classic two to one formula in a study from 2013.
How it compares
The nutritionfield — SKUs we’ve researched or seen mentioned alongside the Science in Sport Beta Fuel. Research a competitor to add its full brief.
+ 11 more in this class.
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