Since 1972 Dietary Supplement Natural Source of GLA Made With Quick-Sorb For Fast Absorption Gluten Free Evening Primrose Oil is a natural source of essential fatty acids such as GLA. Liquid Evening Primrose Oil delivers pure oil in an easily absorbable form. Quik-Sorb is an exclusive blend of herbs known to enhance delivery of nutrients to the body. Nature's Answer. High-quality natural products for vital, healthy lifestyles since 1972. cGMP certified, Organic and Kosher Certified.