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In the most basic terms, retinol is the whole vitamin A molecule, which is one of the best vitamins for your skin. Vitamin A is a potent antioxidant, and works to protect your skin from free radicals, generates cell growth, and repairs damaged cells.
With consistent use of a topical retinol or retin-A you can see improvement of fine lines, dark spots, texture, and tone. While an OTC retinol (0.5%-2% concentration) isn't quite as effective or speedy as prescription-strength, it's less likely to cause irritation, redness, and peeling so better for anyone with sensitive or drier skin.