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    1. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    2. Estradiol Estrogen hormone, prescribed in tablet, patch and gel forms
    3. Follistatin Protein that blocks activin, a growth-regulating signal
    4. Alopecia Areata autoimmune disorder causing patchy hair loss
    5. Adenosine Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient