SiS GO Energy + Caffeine Gels are 60 mL isotonic energy gels you can take without water, made for long runs, rides and races. Each gel gives 22 g of carbohydrate plus caffeine: 75 mg in the Berry flavour and 150 mg in Double Espresso. They suit endurance athletes who want carbohydrate and a caffeine lift in one sachet.
At a glance
| Detail | SiS GO Energy + Caffeine Gel |
|---|---|
| Brand | Science in Sport (SiS) |
| Type | Isotonic energy gel with added caffeine |
| Serve size | 1 gel (60 mL), no water needed |
| Carbohydrate per gel | 22 g, from maltodextrin |
| Caffeine per gel | Berry 75 mg; Double Espresso 150 mg |
| Energy and sugars per gel | Berry 376 kJ (89 kcal), 0.8 g sugars; Double Espresso 370 kJ (87 kcal), 0.7 g sugars |
| Added vitamins per gel | Vitamin B6 0.5 mg, folic acid 30 µg, vitamin B12 0.39 µg |
| Servings / sizes we list | 60 mL single-serve gel |
| Flavours we list | Double Espresso, Berry |
| Dietary notes | SiS lists both flavours as suitable for vegans and gluten free. Sweetened with acesulfame K and sucralose. |
What is in SiS GO Caffeine Gels
Carbohydrate. Each gel is mostly water and maltodextrin (33% of the gel), giving 22 g of carbohydrate. That works out to 37 g of carbohydrate per 100 mL. The Australian Institute of Sport (AIS) sports gel fact sheet describes typical gels at 65 to 75 g per 100 mL, and notes that a small number of gels labelled isotonic are made to be taken without water.
The same AIS fact sheet sets out how much carbohydrate helps during exercise: none is needed for sessions under 45 minutes, 30 to 60 g an hour suits endurance exercise of 1 to 2.5 hours, and up to 90 g an hour suits events longer than about 2.5 to 3 hours. One gel covers 22 g of that.
Caffeine. The AIS caffeine fact sheet says small doses of about 2 to 3 mg per kg of body mass (around 200 mg) are effective for performance, and that caffeine can work when taken before exercise, spread through it, or late in exercise as fatigue sets in. It also notes that sports foods such as gels typically carry 20 to 100 mg per serve, so the 150 mg Double Espresso gel is a stronger option than most.
Everything else. Both gels add vitamins B6 and B12 and folic acid, plus two sweeteners (acesulfame K and sucralose).
Who it suits
- Runners, cyclists and triathletes doing sessions longer than about an hour who already fuel with gels.
- Athletes who want caffeine late in a race in the same sachet as their carbs.
- People who prefer not to take water with every gel.
- Berry for a smaller 75 mg dose; Double Espresso only for those who know caffeine sits well with them.
Who should check first
- Pregnant or breastfeeding: FSANZ advises no more than 200 mg of caffeine a day from all sources. SiS states the Double Espresso gel is not intended for pregnant women.
- Under 18: SiS says the Double Espresso gel is not intended for children or under 16s. FSANZ advises under 18s to have no more than 3 mg of caffeine per kg of body weight in a single serving.
- Caffeine sensitivity, heart conditions or medication: the AIS lists a faster heart rate, anxiety and poorer fine motor control as possible side effects. Check with your GP first.
- Evening sessions: the AIS notes caffeine can affect sleep even at low intakes, and about half is still in your blood around 5 hours later.
- Drug-tested athletes: see the FAQ below and our guide to supplements for drug-tested athletes.
How to use SiS GO Caffeine Gels
SiS suggests one gel about 30 minutes before intense exercise, then one or two more towards the end of a long session when you need a boost in alertness. For short, high-intensity events, the SiS Australia Double Espresso listing suggests one gel an hour before, and no more than 2 Double Espresso gels a day in longer events.
Food Standards Australia New Zealand (FSANZ) advises adults to have no more than 400 mg of caffeine a day from all sources and no more than 200 mg in a single serving. Two Double Espresso gels at once would be 300 mg, so space them out, and count coffee and pre-workout too. If you are new to caffeine gels, start with half a serve, such as half a Berry gel in training. Read more in our guide to how much caffeine is safe.
The AIS advises practising gels in training to check how your gut copes. Isotonic gels do not replace drinking, so plan your fluids too, especially on hot days (see our hot weather hydration guide).
How it compares
- SiS GO Isotonic Energy Gels: the same 22 g of carbohydrate per 60 mL gel, without caffeine. Handy for most of your fuelling, with a caffeine gel saved for later.
- Cyborg Sport HBCD: an unflavoured carbohydrate powder made from waxy corn starch that you mix into a drink, with no caffeine. It suits people who would rather drink their carbohydrate than carry gels.
Where to buy SiS GO Caffeine Gels in Melbourne and Australia
Buy SiS GO Energy + Caffeine Gels online at Supps247 with delivery Australia-wide, or order online and use click and collect at one of 11 Supps247 stores that offer online pickup. Supps247 has 18 stores, 17 in Victoria plus Richlands in Queensland. Find your closest one with the store locator. Staff can help you compare labels in store.
Seen it cheaper at another Australian retailer? Ask about our price match guarantee. Conditions apply.
SiS caffeine gel review: our verdict
SiS GO Caffeine Gels are a dependable pick for runners and riders who already use gels and want carbohydrate and caffeine in one sachet, with no water needed. The two strengths are the standout: Berry's 75 mg suits a first try or an early boost, while Double Espresso's 150 mg is stronger than most gels, so save it for experienced caffeine users late in a long event. The trade-offs are volume and caffeine stacking. You swallow 60 mL for 22 g of carbohydrate, and two Double Espresso gels close together reach 300 mg. Practise in training, and use plain GO Isotonic gels for most of your fuelling.
FAQs
How much caffeine is in an SiS GO caffeine gel?
The Berry gel has 75 mg of caffeine and the Double Espresso gel has 150 mg. Both give 22 g of carbohydrate per 60 mL gel. FSANZ advises adults to keep to 200 mg or less in a single serving.
How many caffeine gels can I have in a day?
Count all your caffeine for the day. FSANZ advises adults to have no more than 400 mg a day from all sources, which is five Berry gels or two Double Espresso gels if you have no other caffeine. SiS Australia says no more than 2 Double Espresso gels a day.
When should I take a caffeine gel?
SiS suggests one gel about 30 minutes before intense exercise and one or two more towards the end of a long session. The AIS notes caffeine can work before, during or late in exercise, so test your timing in training first.
Do I need water with SiS GO caffeine gels?
No. The gels are isotonic, so they are made to be taken without water. You still need to drink to your usual hydration plan during long or hot sessions.
Are SiS GO caffeine gels vegan?
SiS lists both the Berry and Double Espresso gels as suitable for vegans and gluten free. They contain the sweeteners acesulfame K and sucralose.
Can drug-tested athletes use SiS caffeine gels?
The AIS notes caffeine was removed from the World Anti-Doping Agency Prohibited List in 2004. GO Energy + Caffeine Gel is listed on the Informed Sport website, but certification is batch specific, so check your batch number on the Informed Sport site and follow Sport Integrity Australia advice.
Label details checked against the official Science in Sport Australia product page on 19 October 2026. Formulas can change, so always read the label on the product you buy and follow the directions.
Sources: Science in Sport Australia, GO Plus Caffeine Gel 60ml Berry Single; Science in Sport Australia, GO Plus Caffeine Gel 60ml Double Espresso Single; Science in Sport Australia, GO Plus Caffeine Gels 60ml 30 Pack Double Espresso; Science in Sport Australia, GO Plus Caffeine Gels 60ml 30 Pack Berry; Science in Sport Australia, GO Plus Isotonic Energy Gel 60ml Orange Single; Informed Sport, GO Energy + Caffeine Gel; FSANZ, Caffeine powders and high caffeine content foods; Australian Institute of Sport, Caffeine; Australian Institute of Sport, Group A supplements (Sports Gel fact sheet); Sport Integrity Australia, Supplements in sport; Cyborg Sport, HBCD Highly Branched Cyclic Dextrin 900g
