Free UK Delivery On Orders Over 50£

25% Saving
Marathon Bundle (Gel30 & SLT+)
Marathon Bundle (Gel30 & SLT+) Marathon Bundle (Gel30 & SLT+) Marathon Bundle (Gel30 & SLT+) Marathon Bundle (Gel30 & SLT+)

*Exclusive* Marathon Bundle

1x Box of SLT+ (30 Sachets) + 2x Boxes of Gel30 Neutral (24 Gels)

Most gels deliver carbs at the wrong ratio, cause GI distress by mile 15, and taste so sweet you'd rather bonk than take another one. Most electrolyte tabs give you 300–500mg sodium — barely enough for a half.

GEL30 uses a 1:0.8 maltodextrin-to-fructose ratio — the gold-standard split for maximum carbohydrate oxidation at minimum gut cost. 30g of dual-carb energy per gel. Neutral flavour so it stays palatable from your first training run to race day gel 8. SLT+ delivers 1,080mg sodium per sachet alongside potassium, magnesium, and calcium — a quad-blend built for runners who actually sweat.

This bundle: 24 gels and 30 electrolyte sachets. Enough to build your race nutrition plan across a full training block and execute it when it counts. pH-balanced, zero colourants, Informed Sport certified.

Select SLT+ High-Strength Electrolyte Supplement (Flavour):

Variety BoxOrangeBerry & Lime
Quantity
£59.99£79.99
SRP: £79.99

In stock at our UK warehouse

Free delivery on orders over £50

Shop now. Pay with Klarna.

for delivery on

30 day money back guarantee

Informed Sport logo

Trusted by elite athletes

Every batch tested. Every product certified.

Informed Sport certification is the gold standard in sports supplement testing. Every batch of our SLT+ goes through independent analysis at LGC laboratories — screening for 250+ banned substances on the WADA prohibited list.

Batch-tested at LGC laboratories — the world's leading sports anti-doping lab, testing for 250+ banned substances on WADA's prohibited list.
Full supply chain audit — from raw ingredient sourcing through manufacturing and packaging. Every touchpoint verified.
Trusted by the best — used by Team GB, World Marathon Majors runners, and professional cycling teams.
WADA CompliantLGC TestedUK Anti-Doping
Marathon Bundle

The fuel system designed for the runner who refuses to hit the wall.

The Science

The 1:0.8 ratio your gut has been waiting for.

Traditional gels use a 2:1 maltodextrin-to-fructose ratio. Research shows 1:0.8 maximises carbohydrate oxidation while minimising gut discomfort — critical when you're 20 miles in.

SLT+ delivers 1,080mg sodium per serving — more than double most competitors — alongside potassium, magnesium, and calcium.

Informed SportpH BalancedVeganZero ColourantsUK Made

Carbs per gel

More carbs per gel = fewer gels to carry, fewer stops, less GI risk.

SiS GO Isotonic22g
Maurten Gel 10025g
STYRKR GEL3030g

This is what £59.99 gets you.

54 individual servings.
Enough for training and race day.

24
Energy Gels
+
30
SLT+ Sachets
GEL30
SLT+
GEL30 Neutral
24 × included

GEL30 Neutral

30g dual-carb energy gel with a 1:0.8 maltodextrin-to-fructose ratio. Neutral flavour that works from gel 1 to gel 7.

30g carbs1:0.8 ratioNeutral flavourInformed Sport
SLT+ Electrolytes
30 × included

SLT+ Electrolytes

1,080mg sodium quad-blend with potassium, magnesium and calcium. For runners who actually sweat.

1080mg sodiumQuad-blend3 flavoursVegan
Fuel Calculator

How many gels do you actually need?

Tell us your target carb intake and estimated finish time. We'll work out your exact race-day gel count.

The science: Your body runs on stored glycogen for the first ~6 miles. After that, you need a gel every 20–30 minutes. We do the maths so you don't have to.
Enter your race plan
GEL30 gels on race day

Real results, real people