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