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    1. Follistatin Protein that blocks activin, a growth-regulating signal
    2. Exosomes Tiny cell-derived particles offered by clinics as an injectable treatment
    3. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    4. Fluridil Topical anti-androgen sold as a cosmetic lotion
    5. Ketoconazole Antifungal, best known as a dandruff shampoo