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    1. Biotin B vitamin, often sold as a hair supplement
    2. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    3. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    4. Osteopontin Signalling protein studied in hair-growth research
    5. Hair Fibers cosmetic product that temporarily makes hair appear thicker