The short version

Pills give you dose control; gels bundle caffeine with carbohydrate you also need. Caffeine has reasonably good evidence behind it as an endurance aid, and the sensible way to use it is deliberately rather than continuously. A gel delivers a modest fixed dose along with fuel, which is convenient and hard to track. A tablet lets you decide exactly how much and when, which is what you want if you are saving caffeine for the night section rather than sipping it all day.

Common questions

How much caffeine is useful?

The endurance literature generally uses moderate doses relative to bodyweight rather than large ones, and more is not better. Very high intakes cause jitters, a raised heart rate, gut distress and poor sleep afterwards. Work out what your own stomach and head tolerate in training.

Is caffeine safe for everyone?

No. If you have a heart rhythm problem, high blood pressure, an anxiety disorder, or are pregnant, or take medication that interacts with stimulants, talk to a doctor before using caffeine as a training aid. Caffeine has also been linked to serious harm in overdose, which is easier to reach with tablets than with coffee.

Does caffeine dehydrate you?

At the doses athletes use, the diuretic effect is modest and habitual users adapt to it. It is not a reason to avoid caffeine in heat, and it is also not a substitute for drinking.

Fuel and caffeine together

Honey Stinger Caffeinated Energy Gel

~$15

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Precise dosing

Nutricost Caffeine 100mg, 250 count

~$12

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At a glance

Honey Stinger Caffeinated Energy GelNutricost Caffeine 100mg, 250 count
Carbohydrate included Yes No
Dose control Fixed per gel Precise, per tablet
Cost per dose Higher Very low
Stomach load Adds sugar None
Easy to overdo Yes, if you keep eating them Yes, if you keep taking them
Useful late at night Yes Yes

Choose the Honey Stinger Caffeinated Energy Gel if…

You want one thing in your hand doing two jobs. A caffeinated gel arrives with carbohydrate, which is what your legs need anyway, and it is simple to plan into a fuelling schedule. The problem is drift: if every gel in your pocket is caffeinated, you have no control over total intake by hour ten.

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Choose the Nutricost Caffeine 100mg, 250 count if…

You want to hold caffeine back and use it deliberately. Tablets cost almost nothing per dose and let you take a defined amount at the point where it will help, typically before a night section or a low patch. Take them with fluid and food rather than on an empty stomach.

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Related

Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these products side by side. Confirm current specifications and prices before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.