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The two are often believed to be interchangeable, but the main difference is that retinol is eventually converted into retinoic acid. Retinol is a natural form of vitamin A, while Retin-A is derived from retinoic acid, a synthetic derivative of vitamin A, and considered pharmaceutical.
the medical ingredient retinol is also known as retin a and retinoid and is a derivative of vitamin a this potent substance is used in many cosmetic and pharmaceutical skin creams gels lotions and ointments for its skin exfoliating and rejuvenating effects