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