Retinyl oleate is A fatty acid ester formed from oleic acid and all-trans retinol (vitamin A) that is used in the preparation of oily acne treatment preparations.
9-cis-Vitamin A palmitate (9-cis-Retinyl palmitate) is a 9-cis isomer resulting from the interaction of vitamin A palmitate in corn flakes. It exhibits a biological activity of 26% compared to all-trans-vitamin A palmitate, which is known to be the most biologically active form of vitamin A.