Adjust for rater and source bias

Crowdsourced drug ratings (from forums or informal surveys) are systematically distorted by who posts and where they posted. Controlling for per‑user rating tendency and source‑specific effects (via mixed‑effects models) changes the apparent ranking of perceived efficacy and helps separate expectation/placebo signals from consistent drug effects. — If policy, clinicians or harm‑reduction groups rely on community ratings, they must correct for rater/source bias or else misidentify harmless supplements as effective and miss safety risks like dependence and withdrawal.