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    1. Caffeine Stimulant used in hair shampoos and lotions
    2. Tofacitinib JAK inhibitor pill, an immune-system drug
    3. Clascoterone Topical androgen-receptor blocker, approved as an acne cream
    4. Melatonin Hormone that regulates sleep, sold as a supplement
    5. Baricitinib JAK inhibitor pill used for severe alopecia areata