Take by mouth or all over body, 1oz. Hemp oil is also a rich source of gamma linolenic acid (GLA), a type of omega-6 fatty acid. A 2011 study suggests that adding omega-3s, such as those found in hemp oil, to your diet can reduce inflammation. Inflammation can contribute to diseases such as cancer and heart disease. Research indicates that the omega-3s and omega-6s in hemp oil may be effective in treating a number of skin conditions, including: Acne, Eczema, Psariosis, Lichen Planus.