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    1. Biotin B vitamin, often sold as a hair supplement
    2. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    3. Hydrocortisone Mild corticosteroid used on the skin and scalp
    4. GT20029 Experimental topical drug designed to break down androgen receptors
    5. Alopecia Areata autoimmune disorder causing patchy hair loss