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    1. Minoxidil Vasodilator used on the scalp and, at low doses, as a tablet
    2. Adenosine Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient
    3. Follistatin Protein that blocks activin, a growth-regulating signal
    4. Stem Cell Factor
    5. Biotin B vitamin, often sold as a hair supplement