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).1: https://jissn.biomedcentral.com/articles/10.1186/s12970-017-...
2: https://link.springer.com/article/10.1023/A:1022465203458
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