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    1. Microneedling Technique that makes tiny punctures in the scalp with fine needles
    2. Melatonin Hormone that regulates sleep, sold as a supplement
    3. Mesotherapy Injections of drug or vitamin mixtures into the scalp
    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