Holland & Barrett Cold Pressed Natural Evening Primrose Oil Capsules 1300mg plus Vitamin B6 is a dietary supplement that contains natural evening primrose oil and vitamin B6. These capsules are cold-pressed to preserve the beneficial properties of the oil. Evening primrose oil is a rich source of fatty acids, specifically Linoleic Acid (LA) and Gamma Linoleic Acid (GLA). Linoleic Acid is metabolized in the body to GLA, which is essential for the production of certain hormone-like substances called prostaglandins. These prostaglandins play important roles in various bodily functions, including regulating inflammation, hormone balance, and immune response.