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    1. Caffeine Stimulant used in hair shampoos and lotions
    2. Adenosine Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient
    3. Minoxidil Vasodilator used on the scalp and, at low doses, as a tablet
    4. Alfatradiol Weak form of estrogen applied to the scalp
    5. Ketoconazole Antifungal, best known as a dandruff shampoo