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    Learn 5 of 7

    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. Alfatradiol Weak form of estrogen applied to the scalp
    4. Melatonin Hormone that regulates sleep, sold as a supplement
    5. Rapamycin Immune-suppressing drug, also called sirolimus