Science in Sport: review & honest read
The British brand that built its identity on research-backed transparency. The 1:0.8 ratio you can copy in your own kitchen with a scale, a bag of maltodextrin, and a bag of fructose.
·By Croix
Educational, not medical advice. Recipes and dosages are starting points — individual tolerance varies. Consult a healthcare professional or registered dietitian before changing your nutrition strategy. Full disclaimer.
What does Science in Sport sell?
The Science in Sport products tracked on this site, with macros, current retail price, and the DIY savings if you mix the same macros at home.
- Powder · 1:0.8 ratioScience in Sport Beta Fuel Powder
- Carbs
- 80 g
- Sodium
- 460 mg
- Calories
- 320 kcal
- Retail
- $2.70/serving
- DIY save
- ~67% off
As an Amazon Associate I earn from qualifying purchases.
Who is Science in Sport?
Science in Sport (SiS) is the British endurance-sports-nutrition brand most directly responsible for popularizing the 1:0.8 glucose-to-fructose ratio. Their flagship Beta Fuel powder (post-2021 reformulation) is a research-paper-derived formula with a logo on the bag — the company itself describes the carbohydrate split openly, and the marketing leans on the O'Brien & Rowlands citations more than on proprietary claims.
Among the brands in this category, SiS is the most DIY-friendly by a wide margin. Maurten has the hydrogel. Skratch has Cluster Dextrin. Precision has the sweat test. SiS Beta Fuel is, more than anything else, a bag of matched-ratio sugars — and they tell you exactly what's in it.
What's their formulation philosophy?
Beta Fuel's post-2021 design is unusually pure: roughly 57% maltodextrin, 42% fructose, ~1% flavoring. No sucrose, no significant electrolytes (~4 mg sodium per 80 g serving), no proprietary blends. The deliberate stripping of electrolytes pairs Beta Fuel with SiS Go Hydro, which carries the sodium separately — the same fuel-and-hydration decoupling that Precision Fuel & Hydration uses.
The 1:0.8 glucose-to-fructose ratio is exactly what O'Brien & Rowlands 2013 identified as the practical dual-transporter optimum at intake rates of 80 g/hr or higher. SiS was among the first mainstream brands to build a product specifically around it. The strict simplicity of the recipe is the entire pitch.
Mixed at SiS's recommended 500 ml, Beta Fuel sits at ~16% carb concentration — well above the conventional 6–8% sweet spot for gastric emptying. Without a hydrogel to encapsulate the carbs, the high concentration is the tradeoff for fuel density in a single bottle. Athletes who want faster gastric clearance can dilute to 750 ml (~10.7%) or 1000 ml (~8%); the ratio and oxidation math don't change.
What they do well
- Transparency. SiS publishes the formulation logic and cites the underlying research directly.
- The 1:0.8 ratio is exactly right at high carb intakes — and Beta Fuel doses it cleanly.
- Decoupled sodium design — letting athletes scale electrolytes independently of carbs is the right call for hot-weather racing.
- Pre-measured sachets are useful for race-day pacing and feed-zone logistics.
- Lower retail price than Maurten for a chemically equivalent dual-transporter drink.
Where they're overpriced
- Beta Fuel retails ~$2.70 per 80 g serving. The matched-macros DIY equivalent (maltodextrin + fructose + salt) costs ~70 cents.
- The brand premium pays for pre-measured sachet logistics, batch-consistent flavor, and quality control. Worth paying for on race day; harder to defend across daily training.
Pro & elite adoption
SiS was the long-time fuel sponsor of Team Sky and INEOS Grenadiers; INEOS moved to Maurten from 2025. SiS continues to sponsor British endurance programs across cycling, running, and triathlon. The pro fuel is the same shelf product — there's no pro-only version of Beta Fuel, which fits the brand's research-transparency identity.
Is Science in Sport actually worth it?
SiS is the easiest premium brand to recommend at retail price. The macros land where the research points (1:0.8 at 80 g/serving), the sodium-decoupling is the right design for athletes who tune electrolytes separately, and at $2.70 per serving Beta Fuel is the cheapest of the 1:0.8 premiums. For race-day convenience, sachet logistics, or a preference for a branded fuel, Beta Fuel is a sane choice.
It's also the easiest brand to replicate at home, because the recipe is public. Bulk maltodextrin (44 g), crystalline fructose (36 g), a pinch of salt, and optional flavoring delivers the same drink for under $1 a bottle. The DIY teardown linked below walks through the exact proportions. SiS earns its retail price for race-day convenience; for daily training, the kitchen version is the same drink for ~25% of the cost.
Or skip retail and DIY
The DIY teardowns below walk through the exact gram quantities, shopping list, and per-serving cost for a kitchen-mixed version of Science in Sport's key products.
How does Science in Sport stack up against rivals?
- Maurten 320 vs SiS Beta Fuel — Same Drink, Different Price · Same 1:0.8 ratio, same 80 g of maltodextrin + fructose, ~$1 cost difference per serving. The hydrogel is the only meaningful chemistry difference — and the matched-dose evidence doesn't support the price gap.
The ingredients in Science in Sport's line
- Maltodextrin · The glucose-polymer workhorse in almost every high-carb sports drink — same energy as dextrose, far lower osmolality, nearly tasteless.
- Fructose · The GLUT5-transported sugar that lets you push past the 60 g/hr glucose ceiling — pair with maltodextrin at ~1:0.8 for the modern dual-transporter formula.
- Table Salt (Sodium Chloride) · The cheapest, most-bioavailable sodium source in your kitchen — pennies per gram and chemically identical to what's in any electrolyte tab.
- Sodium Citrate · A smoother-tasting sodium source than table salt — the alkalising buffer commercial drinks use to dose sodium without the bite.