이 원료는 프로피오닉 애씨드와 레티놀의 에스터이다.

Retinyl propionate: Retinol is a synthetic vitamin A ingredient. Cosmetics with synthetic retinoids can contribute to overdoses of this potent vitamin. Furthermore when exposed to UV light, retinol compounds break down and produce toxic free radicals. Two vitamin A ingredients (retinoic acid and retinyl palmitate) have been shown to speed the development of skin tumors and lesions on sun-exposed skin.

本品は、プロピオン酸（＊）とレチノール（＊）のエステルである。