- Starflower seeds have the highest GLA level of any plant - Each 1000mg capsule provides a guaranteed 220mg of GLA Starflower (borage) seeds have the highest Gamma-Linolenic Acid (GLA) level of any plant material, and these capsules have a guaranteed level of 220mg GLA, making this product one of the strongest available. This means that each capsule provides the same amount of GLA as found in two 1000mg evening primrose capsules. Lamberts use only the purest starflower oil and these capsules are made in the UK to pharmaceutical GMP standards. Starflower oil is often recommended instead of evening primrose oil to women going through the menopause as well as for women at the time of their period.