Science in Sport GO Isotonic Energy Gel

22 g carbs per 1 gel (60 ml) · glucose-type only. Graded for five standard jobs below — the same product fits some jobs and not others.

single-sourceisotonicartificial sweetenersvegangluten-freebatch-tested (informed-sport)
Check it for your own job →

Job fit

It falls short for Marathon, 70.3, IRONMAN, Ultra — see the reasons under each grade.

Marathon
3.5 h · race · target 80 g/h → 3.6/h
D
✗ single-source · pair with a fructose source✓ gut-friendly≈ 3.6/h · a lot to carry runningℹ caffeine not statedℹ sodium not statedℹ isotonic — no extra water needed
70.3
5.5 h · race · target 90 g/h → 4.1/h
D
✗ single-source · pair with a fructose source✓ gut-friendly≈ 4.1/h · a lot to carryℹ caffeine not statedℹ sodium not statedℹ isotonic — no extra water needed
IRONMAN
12 h · race · target 90 g/h → 4.1/h
D
✗ single-source · pair with a fructose source✓ gut-friendly≈ 4.1/h · a lot to carryℹ caffeine not statedℹ sodium not statedℹ isotonic — no extra water needed
Century / gran fondo
5 h · steady · target 80 g/h → 3.6/h
C
✗ single-source · pair with a fructose source✓ gut-friendly✓ 3.6/h · easy to carryℹ caffeine not statedℹ sodium not statedℹ isotonic — no extra water needed
Ultra
10 h · steady · target 80 g/h → 3.6/h
D
✗ single-source · pair with a fructose source✓ gut-friendly≈ 3.6/h · a lot to carry runningℹ caffeine not statedℹ sodium not statedℹ isotonic — no extra water needed

Grades: A–E from absorption (35 %), gut (30 %), practicality (15 %), caffeine (10 %) and your preferences (10 %); a ✗ on absorption or gut caps at C. Sodium and tonicity are shown as ℹ and never change the grade.

What is in it

Label facts, not a score. Apply your own preferences in the checker.

Format
Isotonic gel
Unit
1 gel (60 ml)
Carbohydrate
22 g
Carb sources (label order)
maltodextrin
Glucose:fructose
glucose-type only · ~0 % fructose (inferred)
Sodium
not stated
Potassium
not stated
Caffeine
not stated
Protein / fat / fibre
not stated / not stated / not stated
Sugar alcohols
none listed
Sweeteners
acesulfame K
Allergens
not stated
Vegan / gluten-free
vegan / gluten-free
Batch-tested
informed sport
Tonicity
isotonic

Isotonic — "no need for additional water" per the maker. Ingredients (label): water, maltodextrin (33 %), gelling agents, natural flavouring, acidity regulators, preservatives (sodium benzoate, potassium sorbate), sweetener (acesulfame K), sodium chloride, ascorbic acid. Maltodextrin only, so single-source. Vegan / gluten-free per the maker's listing.

From the manufacturer's page, checked 2026-09-18 · source. Labels change; read the pack. Not medical advice; not affiliated with the brand.

How many Science in Sport GO Isotonic Energy Gel per hour do I need?

At 22 g carbs per 1 gel (60 ml): about 2.7 per hour for 60 g/h and 4.1 per hour for 90 g/h. Use the fuel checker to set your own job.

Is Science in Sport GO Isotonic Energy Gel dual-source (glucose and fructose)?

No — its carbs are glucose-type only (glucose-type only). Fine up to about 60 g/h; above that, pair it with a fructose source.

Does Science in Sport GO Isotonic Energy Gel contain caffeine?

Caffeine is not stated on the source we checked — read the pack.

Other isotonic gels