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    1. Melatonin Hormone that regulates sleep, sold as a supplement
    2. Caffeine Stimulant used in hair shampoos and lotions
    3. Estradiol Estrogen hormone, prescribed in tablet, patch and gel forms
    4. Hydrocortisone Mild corticosteroid used on the skin and scalp
    5. Finasteride Popular 5-alpha reductase inhibitor that lowers DHT, taken as a pill or used topically