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