January 2020 in “Estetologia Medyczna i Kosmetologia” This review reports that most active ingredients in Polish hair loss products lack scientific backing for their effectiveness against hair loss, with some even having counterproductive effects.
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.
November 2025 in “Cosmetics” This study found that of the many ingredients advertised in shampoos as effective against hair loss, only caffeine, adenosine, placental proteins, and melatonin have limited clinical evidence supporting their efficacy, with most claimed active ingredients lacking any trial-based validation.
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March 2018 in “Dermatologie pro praxi” This article reviews over-the-counter products and active ingredients marketed for hair loss treatment, noting that many lack robust efficacy evidence except for minoxidil, which has temporary effects, and highlights the caution needed when recommending products to pregnant and breastfeeding women.
This study found that while various cosmetic compounds are used for androgenetic alopecia, detailed understanding of their mechanisms of action for effective home treatment is lacking.