Winterized DHA Algal Oil, or winterized Docosahexaenoic Acid (DHA) Oil, is obtained by biological fermentation of Schizochytrium sp. strains in a fully controlled sealed fermenter, then winterization technology is used to remove excess saturated fatty acid components and impurities.
link:http://www.xhhumannutrition.com/human-nutrition/lipid-nutrition/winterized-dha-algal-oil.html