Sisu Evening Primrose Oil - 1000 mg - For those requiring nutritional support with Omega 6 Fatty Acids, Sisu cold-pressed Evening Primrose Oil, is an excellent source of Linoleic Acid and GLA. Essential Fatty Acids are not manufactured by the body and must be derived from foods or supplements. Evening Primrose Oil has been found effective in treating and relieving symptoms of PMS and menopause, eczema, arthritis, heart disease, multiple sclerosis and diabetes.