What about '3:6:9' capsules as supplementary sources?

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The fairly popular '3:6:9' capsules contain omega-3 fatty acids (often in the form of a-linolenic acid (ALA) from flax oil or other sources) along with omega-6 fatty acid (as linoleic acid from common vegetable oils or gamma-linolenic acid from sources such as primrose or borage oil) and omega-9 fatty acid (which is a common constituent of olive oil, canola oil, and numerous other vegetable oils). The human body has a high capacity for naturally and readily biosynthesizing the omega-9 fatty acid (oleic acid) by the existing metabolic pathways in humans. Furthermore, humans consume many grams of oleic acid (omega-9) daily in their normal dietary/foods. Omega-9 is not regarded as an essential fatty acid in the diet because of its ease of formation in the body. North Americans and those in many other countries have very high intakes of omega-6 fatty acids (for example, up to 15-20 g per day in a typical North American diet mainly as linoleic acid). The omega-6 fatty acid known as linoleic acid is required in the diet at a level of approximately 1-2 % of daily energy (approximately 2-4 g/day). The current North American consumption is well above these levels on average and reports of omega-6 deficiency are extremely rare. The omega-6 fatty acid known as gamma-linolenic acid, which can be formed via metabolism from linoleic acid in the liver and elsewhere, is not considered as an essential fatty acid and no recommended daily intakes for GLA (gamma-linolenic acid) have been advocated. Omega-3 fatty acids are commonly under-consumed in many populations based on official recommended daily intakes for optimal health as well as recommendations for optimal cardiovascular care such as those from the American Heart Association who advocate 900 mg/day of DHA plus EPA in individuals with coronary heart disease.