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    1. Melatonin Hormone that regulates sleep, sold as a supplement
    2. Cetirizine Antihistamine allergy medicine
    3. Caffeine Stimulant used in hair shampoos and lotions
    4. Microneedling Technique that makes tiny punctures in the scalp with fine needles
    5. KY19382 Experimental compound that activates hair-growth signals, tested only in animals