Omega-3 and Omega-6 fatty acids are two groups of essential fatty acids (EFA); acids that the body cannot make, so we need to get them from our food, or our skincare.
Omega-6 fatty acid is the most important from a skincare point of view as a deficiency in linoleic acid can lead to dry skin, and wrinkles. Wheatgerm oil (found in Stretch Mark Oil) is one of the best sources of Omega-6, and also Vitamin E. Other good sources are Evening Primrose Oil and Gold of Pleasure Oil.