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    1. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    2. Biotin B vitamin, often sold as a hair supplement
    3. Rapamycin Immune-suppressing drug, also called sirolimus
    4. Alfatradiol Weak form of estrogen applied to the scalp
    5. Melatonin Hormone that regulates sleep, sold as a supplement