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    1. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    2. Tretinoin Vitamin A retinoid cream, prescribed for acne
    3. Clascoterone Topical androgen-receptor blocker, approved as an acne cream
    4. Follistatin Protein that blocks activin, a growth-regulating signal
    5. Alopecia Areata autoimmune disorder causing patchy hair loss