Martek Biosciences Corporation has been awarded European Patent No. EP-B-0 568 606, covering compositions and uses of blends of docosahexaenoic acid (DHA) and arachidonic acid (ARA) containing oils as additives or supplements for the human diet and infant formula. The patent covers the blending of DHA from microbial or fish oil sources with any microbial source of ARA and the inclusion of this blend in infant formula, nutritional supplements and food ingredients.