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    1. Follistatin Protein that blocks activin, a growth-regulating signal
    2. Ketoconazole Antifungal, best known as a dandruff shampoo
    3. Procyanidin Plant polyphenol found in apples and grape seeds
    4. Rosemary Herb whose oil is used in hair care
    5. Biotin B vitamin, often sold as a hair supplement