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    1. Minoxidil Vasodilator used on the scalp and, at low doses, as a tablet
    2. Clascoterone Topical androgen-receptor blocker, approved as an acne cream
    3. Cetirizine Antihistamine allergy medicine
    4. Melatonin Hormone that regulates sleep, sold as a supplement
    5. Caffeine Stimulant used in hair shampoos and lotions