A low 200 mg caffeine dose from whole coffee cherry extract helped trained cyclists produce 4.6% more work in a 15-minute time trial. But the popular idea that it speeds up glycogen refuelling didn't hold up. This randomized, double-blind crossover trial involved just 12 cyclists and was industry-funded, with no plain-caffeine comparison group. Here's what the data show, what they don't, and who might want to try it.
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