A chili-derived compound called phenylcapsaicin just went through a triple-blind crossover trial with 50 CrossFit athletes. A single 2.5 mg dose taken 45 minutes before training improved post-session squat load and reps, reduced jump-height loss, and lowered soreness at 24 and 48 hours. But it did nothing for the WOD itself, and lactate, RPE, and heart rate didn't budge. Two authors also advise a supplement brand, and the study only covers a single acute dose. Here is what the data show, what they don't, and who might actually want to try it.
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