EpiCor® is produced entirely from Saccharomyces cerevisiae, following the patented MetaGen4™ process. The culture is provided with ample oxygen for optimal growth, then at the point where it is most healthy the oxygen level is reduced. This stresses the culture and it responds adaptively, producing protective anti-stress metabolites. The yeast cells and culture liquid are then harvested, dried, and standardized into EpiCor® using rigorous bioanalysis and other quality assurance protocols. EpiCor® is a high metabolite immunogen.