Best Caffeine Gels for Racing: Ranked by Dose and Timing
2026-06-14 · 4 min read
Rapid answer
Maurten Gel Caf 100 delivers the most reliable 100 mg caffeine dose with the best GI tolerance. Clif Shot Turbo is the best-value 100 mg option. GU Energy with caffeine works for athletes who want smaller, more frequent doses.
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The caffeine calculator tells you how many milligrams to take and when. The gel you choose determines whether you actually hit that dose reliably. Product caffeine declarations vary in accuracy, and some gels trigger GI distress at race intensity even when the dose is correct. Here is what to use.
The best caffeine gels in 2026
1. Maurten Gel 100 Caf 100 (best overall)
Maurten's hydrogel technology gives it the best GI tolerance profile of any caffeinated gel, which matters when caffeine already stimulates the gut at high intensity. The Caf 100 version delivers exactly 100 mg of caffeine alongside 25 g of carbohydrate. For a 70 kg athlete targeting 3 mg/kg (210 mg total), two Caf 100 gels covers the full pre-race dose with 10 mg to spare.
Caffeine per sachet: 100 mg Carbs per sachet: 25 g Sodium: 55 mg Best for: athletes with sensitive stomachs; anyone using Maurten as their primary gel Not ideal for: budget-conscious athletes; athletes who need caffeine doses under 50 mg per serving
Maurten Gel 100 Caf 100 on Amazon (affiliate link)
2. Clif Shot Turbo (best value at 100 mg)
At roughly $1.50 to $2.00 per gel, Clif Shot Turbo is the most affordable mainstream 100 mg caffeine option. The carbohydrate blend uses maltodextrin and brown rice syrup. Some athletes find the thicker texture harder to take at race pace without water, but the dose accuracy and caffeine content are consistent.
Caffeine per sachet: 100 mg Carbs per sachet: 25 g Sodium: 95 mg (highest sodium of the group) Best for: athletes who want 100 mg caffeine at half the price of Maurten; sodium-focused athletes Not ideal for: athletes who struggle with thicker gel textures
Clif Shot Turbo on Amazon (affiliate link)
3. SiS GO Caffeine Gel (best for mid-race top-ups)
SiS's caffeine gel delivers 75 mg per sachet at 22 g of carbohydrate, which is useful for mid-race caffeine top-ups without going over your dose ceiling. If your calculator targets 200 mg total and you have already taken 100 mg pre-race, a SiS gel at mile 18 adds 75 mg without risk of overdoing it.
Caffeine per sachet: 75 mg Carbs per sachet: 22 g Sodium: 12 mg (low, pair with a separate electrolyte source) Best for: mid-race supplemental caffeine doses; athletes doing precise dose math Not ideal for: athletes who want to consolidate all caffeine into one product
SiS GO Energy plus Caffeine on Amazon (affiliate link)
4. GU Energy Gel with Caffeine (best for smaller, frequent doses)
GU offers caffeine gels at 20 mg and 40 mg per sachet, which are useful for athletes who prefer to distribute smaller doses throughout a race rather than front-loading. The 40 mg option taken every 45 minutes during a 4-hour marathon delivers approximately 200 mg over the race, which matches many calculators' targets without a large pre-race bolus.
Caffeine options: 20 mg or 40 mg per sachet Carbs per sachet: 22 g Sodium: 60 mg Best for: athletes who want frequent low-dose caffeine; athletes sensitive to large single doses Not ideal for: athletes who want a single pre-race hit at 3 mg/kg
GU Energy Gel with Caffeine on Amazon (affiliate link)
How to time your caffeine gel
Use the caffeine calculator to find your target dose (typically 3 to 6 mg per kg of body weight). Take 60 to 75 percent of the total dose 45 to 60 minutes before the start. Reserve the rest for mid-race if the event is longer than 90 minutes. A Maurten Caf 100 pre-race plus one Clif Shot Turbo at mile 16 covers a 70 to 75 kg athlete's full dose across a marathon.
Should you use caffeine gels instead of coffee or pills?
Gels combine caffeine with carbohydrates, which is convenient for race day when you are already carrying gels. Caffeine pills (pure caffeine) cost pennies per 200 mg dose and work identically for the performance effect, but they require water to swallow and do not contribute carbohydrates. Coffee is unreliable due to variable caffeine content. For races where you carry gels anyway, caffeinated gels are the most practical format.
Frequently asked questions
How much caffeine is in a typical energy gel?
Most caffeinated energy gels contain 20 to 100 mg of caffeine per sachet. GU Energy gels range from 20 to 40 mg depending on flavor. Clif Shot and Maurten both offer 100 mg options. SiS provides 75 mg. The right dose for performance is 3 to 6 mg per kilogram of body weight total, so a 65 kg runner targeting 3 mg/kg needs about 195 mg, which they could get from two Clif Shot Turbo gels or two Maurten Caf 100 gels.
Can caffeine gels cause stomach problems during a race?
Caffeine stimulates intestinal motility, which at high exercise intensity can cause urgency or GI distress. Maurten's hydrogel format has the best GI tolerance profile among mainstream options. Taking caffeine with too little fluid and at high intensity increases the risk. If you have had GI problems with caffeinated gels in the past, try the Maurten Caf 100 in training before committing to it on race day.
Should I use caffeine gels if I drink coffee every day?
Yes, caffeine works for habitual users, but the effect is smaller because tolerance blunts adenosine receptor sensitivity. A 3-day caffeine taper before a target race (cutting all caffeine for 72 hours before race day) restores receptor sensitivity and significantly increases the performance effect. If a taper is not practical, use the higher end of the dose range (5 to 6 mg/kg rather than 3 mg/kg) to compensate for tolerance.