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    1. Caffeine Stimulant used in hair shampoos and lotions
    2. Neem Oil Oil from the neem tree, used in traditional remedies
    3. Estradiol Estrogen hormone, prescribed in tablet, patch and gel forms
    4. Melatonin Hormone that regulates sleep, sold as a supplement
    5. Hydrocortisone Mild corticosteroid used on the skin and scalp