Key facts
- Boosts alertness, endurance, and strength output.
- Effective dose is roughly 3–6 mg per kg of bodyweight.
- Take about 30–60 minutes before training.
- Tolerance builds with regular use.
Caffeine is a well-proven performance enhancer. By blocking adenosine (a molecule that makes you feel tired), it increases alertness and reduces perceived effort, which translates into better endurance, more reps, and improved focus during training. It's one of the few supplements with strong, consistent evidence behind it.
An effective pre-workout dose is around 3–6 mg per kilogram of bodyweight, taken 30–60 minutes before exercise. Regular use builds tolerance, so some people cycle it for big sessions. Be mindful of late-day caffeine, which can disrupt sleep — and since sleep drives recovery, that trade-off matters.
Frequently asked questions
How much caffeine should I take before a workout?
Roughly 3–6 mg per kg of bodyweight, taken 30–60 minutes before training. Start at the lower end to assess tolerance, especially if you're sensitive.
Does caffeine affect sleep and recovery?
Yes. Caffeine taken too late in the day can disrupt sleep, and since sleep drives recovery, it's best to avoid it in the hours before bed.
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