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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.
Both retinol and retinyl palmitate are widely used ingredients in skin care products. Both are forms of vitamin A. Retinol is a pure form of the vitamin found in green and yellow vegetables, egg yolks, whole milk, beef, chicken, and fish-liver oil.oth are forms of vitamin A. Retinol is a pure form of the vitamin found in green and yellow vegetables, egg yolks, whole milk, beef, chicken, and fish-liver oil.