Description Highest Quality & Potency From Borage Oil The Borage oil in this product is extracted without hexane or other chemical solvents. It uses only the cold process, "expeller-press" method of extraction, which is simply squeezing the oil out of the seed without heat. Twinlab Ultra gla 300 is the highest quality and highest potency gla (gamma-linolenic acid) capsule available, derived from Borage oil. Borage oil is extracted from the seeds of the Borage plant and is the richest natural source of gla.