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    1. Tretinoin Vitamin A retinoid cream, prescribed for acne
    2. Melatonin Hormone that regulates sleep, sold as a supplement
    3. Neem Oil Oil from the neem tree, used in traditional remedies
    4. GHK-Cu Copper peptide used in skin and hair cosmetics
    5. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement