Health From The Sun BIO-EFA Evening Primrose OilT is one of the best sources of the nutrutionally important omega-6 fatty acids, GLA and cis-linoleic acid. The oil is extracted from the highest quality primrose seeds using the cold 3939expeller-press3939 method , without the chemical solvent hexane. It is a BIO-EFA food oil, ensuring the most bioavailable essential fatty acids. Independently tested to guarantee truth-in-labeling and product quality.