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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. Follistatin Protein that blocks activin, a growth-regulating signal
    4. Bimatoprost Prostaglandin eye drop used for glaucoma and eyelash growth
    5. Sulforaphane Compound found in broccoli sprouts