Ingredients of Trichological Shampoos with Alleged Beneficial Effects on Hair: What Is Really Known About Their Efficacy? A Scoping Review of an Area with More Unknowns Than Knowns
October 2025
Studysummary This study found that while many shampoo ingredients are marketed as effective against hair loss, only caffeine, adenosine, placental proteins, and melatonin have moderate clinical evidence for efficacy, and a majority of other claimed active ingredients lack clinical trial verification.
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