Also known as linseed, is a significant plant source of omega fatty acids, primarily an omega-3 fatty acid (linolenic acid) that’s been shown to have a soothing effect on skin and enhance skin’s hydration by preventing moisture loss. Flaxseed oil has been shown to penetrate skin’s uppermost layers easily, carrying other oil-soluble beneficial ingredients with it, such as vitamin E. Flaxseed oil is also a top source of lignans, phenolic plant compounds that have antioxidant ability.