NOW Foods Evening Primrose Oil 500 mg provides a rich source of GLA (gamma-linolenic acid) — an omega-6 fatty acid that the body uses to produce anti-inflammatory prostaglandins (PGE1 series) that regulate hormonal and inflammatory processes. Evening primrose oil typically contains 8-10% GLA, and supplementation with GLA has been clinically studied for PMS relief, menopausal symptoms (hot flashes, breast tenderness), skin conditions including eczema and psoriasis, and rheumatoid arthritis. Unlike most omega-6 fatty acids that promote inflammation, GLA from evening primrose supports the anti-inflammatory prostaglandin pathway — making it a nuanced and beneficial fatty acid supplement for women's health and skin. NOW Foods provides 500 mg per softgel from cold-pressed Oenothera biennis seeds, manufactured in their GMP-certified facility.