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GLA is an unstable substance, highly sensitive to oxidation by exposure to the air, so the way in which Evening Primrose Oil is processed can significantly affect its stability and biological activity. Efamol Ltd has developed its own gentle extraction technique, called hexane extraction, which preserves the oil in a similar condition to that found in the seed, ensuring that it's both pure and of premium quality. The oil does not need further chemical purification or refining, greatly reducing the likelihood of oxidisation and degradation.
Many other evening primrose oils are extracted by a process called 'cold-pressing', in which seeds are squeezed at very high pressure. However, this is only really suitable for seeds containing 40 or 50% oil and has an extremely detrimental effect when applied to seeds like Evening Primrose, that contain only 20 - 25% oil:
Whereas our unique extraction process preserves more than integrity of the oil. Efamol Pure Evening Primrose Oil contains 4 times as many antioxidants like vitamin E, phospholipids and sterols than pressed and refined alternatives.