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    1. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    2. Castor oil Thick plant oil used in hair care
    3. Biotin B vitamin, often sold as a hair supplement
    4. Platelet-Rich Plasma Concentrate of your own blood platelets, injected into the scalp
    5. Tretinoin Vitamin A retinoid cream, prescribed for acne