What it is
Triolein is a triester formed from one molecule of glycerin and three molecules of the monounsaturated fatty acid oleic acid. In formulations it functions as an emollient and occlusive lipid, helping soften the skin surface and reduce moisture loss while contributing a smooth, cushiony feel. It is also a significant natural component of many vegetable oils and of human sebum.
Safety & warnings
Triolein is generally well tolerated as a skin-conditioning lipid. Because it is rich in oleic acid, an unsaturated fatty acid associated with higher comedogenic potential, it may be a consideration for individuals who are acne-prone, though sensitivity varies and depends on the overall formulation.
Origin & sourcing
Triolein occurs naturally as a major glyceride in olive oil and many other vegetable oils, and is a constituent of human skin sebum. The cosmetic ingredient may be isolated from natural fats or produced synthetically by esterifying glycerin with oleic acid.
Questions everyone asks
What does triolein do in a sunscreen?
It acts as an emollient and occlusive lipid, softening the skin surface and helping limit moisture loss to improve the feel of the product.
Is triolein a natural ingredient?
It occurs naturally in olive and other vegetable oils and in human sebum, and can also be made by esterifying glycerin with oleic acid.