“…Several studies in the literature have evaluated the stability of selected retinoids in pharmaceuticals, 4,5 simple solutions, 6,7 parenteral nutrition solutions, 8‐10 experimental cosmetic formulations, 7,11‐16 and commercial cosmetics 17‐19 . The main conclusions, which can be drawn by these studies, are as follows: the stability of retinoids depends on the medium, the pH value, and the presence of other antioxidants, 13,14 and is also affected by environmental storage conditions, since retinoids are liable to light, heat, and oxidation exposure.…”