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    1. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    2. Follistatin Protein that blocks activin, a growth-regulating signal
    3. Alopecia Areata autoimmune disorder causing patchy hair loss
    4. Bimatoprost Prostaglandin eye drop used for glaucoma and eyelash growth
    5. Low Level Laser Therapy Red-light devices, such as caps, combs and helmets, used on the scalp