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    1. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    2. Melatonin Hormone that regulates sleep, sold as a supplement
    3. Dexpanthenol Provitamin B5, a moisturiser in hair and skin products
    4. Peppermint herb and oil thought to stimulate skin and hair
    5. Platelet-Rich Plasma Concentrate of your own blood platelets, injected into the scalp