A single 200 mg dose of Rhodiola rosea taken an hour before exercise nudged time to exhaustion from 16.8 to 17.2 minutes and raised VO2peak in a double-blind crossover trial. The twist is that four weeks of daily dosing didn't build on that effect or change any measured variable. The gain was small, about 24 seconds, and strength, reaction time and attention didn't budge. Here is what the study actually found, who might try an acute dose, and why you shouldn't count on "loading" rhodiola.
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