>One review paper from 2017 concluded that creatine can give athletes a 10-20% performance boost in brief bouts of high-intensity exercise, such as sprinting past a defender or lifting heavy weights.
TFA is non a scientific journal, but summarizing/editorializing results from scientific journals. They don't cite their sources for that particular claim, but it appears to be from this^1 journal, which itself is an overview of other research. The "10-20%" number comes from this^2 2003 review of existing research on creatine that states 70% of the existing research at that time showed statistically significant results and give some example numbers of performance gains with regards to resistance training in the 5-15% range. However, I believe that's just an example from one study out of the many reviewed and I don't have access to more than the abstract. Not that I'd have the scientific/statistical knowledge to properly interpret the meta-analysis, anyway, but ..point being that "10-20%" number from the article can be misleading (surprise, surprise).
>One review paper from 2017 concluded that creatine can give athletes a 10-20% performance boost in brief bouts of high-intensity exercise, such as sprinting past a defender or lifting heavy weights.