higher strength at 12% gla,stronger than straight evening primrose oil,with 10mg vitamin e (83% nrv),veggie- friendly capsuleswe\'ve made this one of the strongest evening primrose oil product available in the uk by blending it with pure starflower oil to raise the gla to 12%, (most evening primrose products contain between 8-10% gla). this makes the product great value for money as it is considerably cheaper than most straight evening primrose products available in the shops.gla is an omega 6 fatty acid which can be made by the body but several studies have shown that a supplement is useful for some people. evening primrose oil is still one of the most popular supplements, a status that is achieved by the simple fact that users find it makes a real difference.our other gla products are shown below, with the strongest being the pure starflower oil product.oil which is fortified with starflower oil.