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    1. Neem Oil Oil from the neem tree, used in traditional remedies
    2. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    3. Biotin B vitamin, often sold as a hair supplement
    4. Rapamycin Immune-suppressing drug, also called sirolimus
    5. Alfatradiol Weak form of estrogen applied to the scalp