Natures Aid Evening Primrose Oil capsules are a rich and natural source of Gamma Linolenic Acid (GLA). GLA is an unsaturated Omega-6 essential fatty-acid, which is essential for maintain brain function, reproductive health and metabolism. It also encourages skin and hair growth. The capsules are easy to take and each capsule provides 100mg of pure cold pressed evening primrose oil. Cold-pressing ensures that no valuable components of the oil are destroyed during production, providing each capsule a guaranteed 8-10% GLA.