Conjugated linoleic acid is a widely used ingredient in cosmetics, personal care, and skincare formulations. Depending on its function, it may serve as a moisturizer, preservative, emulsifier, or active ingredient to enhance the overall effectiveness and performance of a product.
Conjugated linoleic acids (CLA) are a family of isomers of linoleic acid. In principle, 28 isomers are possible. CLA is found mostly in the meat and dairy products derived from ruminants. The two C=C double bonds are conjugated (i.e., separated by a single bond) as opposed by "typical" polyunsaturated fatty acids where double bonds are separated by two single bonds. CLAs are simultaneously both cis-fats and trans-fats, as one of the two C=C bonds is cis and the other trans.

CLA is marketed as a dietary supplement on the basis of its claimed health benefits.