Planetary Formulas Borage Super GLA 300 is a specially prepared oil concentrate expressed from the seeds of the borage plant (Borago officinalis), using a specialized, solvent-free, cold-pressed extraction technique. Borage seeds are a rich source of essential fatty acids, including gamma linolenic acid (GLA), which are essential for human health. These fatty acids are necessary for maintaining the fluidity and flexibility of every cell membrane, and are integral in supporting the body's normal production of prostaglandins. Borage Super GLA 300 provides 300 mg of GLA per serving.