A meta-analysis of 63 studies and 1,489 participants asked how much creatine adds on top of lifting. The strength boost was moderate and consistent in both upper and lower body, while the lean mass gain was smaller and fat mass didn't significantly change. The surprise is that dosing strategy, daily dose and protocol did not significantly influence the results. Age emerged as the one exploratory clue, with larger strength effects in younger participants. Here is what the paper actually found, and what it can't tell you.
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