Borage is otherwise called the starflower, and the borage oil extracted from its seeds is very rich in GLA, gamma-linolenic acid, a polyunsaturated fatty acid also obtainable from evening primrose oil. Borage, however, is richer in GLA and is, therefore, a more economical source that the evening primrose.
A shrub, frequently seen in gardens, borage has historically been used as a salad food, and also in soups, and borage honey is prized in many quarters. Now, however, its main use is for the GLA extracted from the seed, which provides a higher yield of GLA than any other source. Borage seed oil contains up to 25% GLA, compared to 17% from blackcurrant oil and 9% from evening primrose oil.
The importance of GLA to the body0s biochemistry is inestimable, and cannot be overstated. It is not so much the GLA that is so important, but the prostaglandin to which it is converted in the body. Prostaglandin E1 is a hormone-like substance that plays a part in many of the biochemical and metabolic processes of the body. Examples include the control of the immune system and inflammatory response, some kidney functions, and the tone of the arterial muscles,