Why effect size ranks above hype for natural anabolics
Among supplements marketed for muscle, only a few survive contact with controlled trials. Creatine monohydrate sits at the top because dozens of randomized studies show a small but reliable gain in lean mass and strength when paired with resistance training, with a large body of safety data behind it. Most others cluster near a negligible or unproven effect size once placebo and training are accounted for.
Effect size matters more than a list of mechanisms because almost every compound has a plausible pathway in a petri dish. The chart ranks by how large and how repeatable the human outcome is, not by how the marketing reads.
How evidence quality changes the ranking
A compound can show a moderate effect in one small study and vanish in larger ones. Grading by evidence quality (number of trials, sample size, replication, conflict of interest) separates creatine and adequate protein, which hold up, from items like ecdysteroids that rest on a few short or industry-linked studies.
This is general educational information, not medical or training advice. Individual response varies, and supplements interact with diet, sleep, and total training volume. Consult a qualified professional before adding a supplement, especially if you take medication or have a health condition.