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    1. GHK-Cu Copper peptide used in skin and hair cosmetics
    2. Hydrocortisone Mild corticosteroid used on the skin and scalp
    3. Mesotherapy Injections of drug or vitamin mixtures into the scalp
    4. Tretinoin Vitamin A retinoid cream, prescribed for acne
    5. Melatonin Hormone that regulates sleep, sold as a supplement