Evening Primrose Oil, a natural source of gamma-linolenic acid (GLA), is well known for modifying the inflammatory response and maintaining hormonal balance. This versatile oil comes from the tiny seeds of a wildflower, Oenothera biennis L., native to North America, and has been studied for its positive influence on prostaglandin synthesis. GLA may also support the healthy growth and maintenance of skin, hair, and nails.

All of the evening primrose oil used in the Weil formula is cold pressed without the use of solvents. Weil Evening Primrose Oil is encapsulated exclusively in vegetarian, liquid-filled capsules.