What does "clinically proven" or "dermatologist tested" actually mean on a hair care label?

These phrases have no regulatory definition in cosmetics in most markets. There is no standard for what constitutes a clinical trial in hair care - no minimum sample size, no required control group, no mandated publication in a peer-reviewed journal. A study on twelve volunteers by a company-sponsored lab qualifies as "clinically proven." One dermatologist reviewing a formulation for skin irritation qualifies as "dermatologist tested." The implied rigor is not the actual rigor required to use these phrases. Hairstory doesn't use this language. What we have instead: 27,500+ verified customer reviews classified by hair type and pre-existing condition, from paying customers with no incentive to report positively. A structured consumer perception study with 103 participants over three weeks - 85% said they would permanently abandon conventional shampoo; 8 out of 10 rated New Wash the best hair care product they had ever used. And documented color retention and motor oil experiments on video. We describe this evidence for what it is and don't call it clinical proof. The consumer who asks which evidence should carry more weight - a clinically proven label claim from an unpublished internal study, or 27,500 verified accounts - is asking exactly the right question.