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    1. Tretinoin Vitamin A retinoid cream, prescribed for acne
    2. Follistatin Protein that blocks activin, a growth-regulating signal
    3. Lavender Plant essential oil used in scalp products
    4. Procyanidin Plant polyphenol found in apples and grape seeds
    5. Hydrocortisone Mild corticosteroid used on the skin and scalp