a method for upgrading human food and animal feed , rendering harmless the contaminating mycotoxins , increasing protein and nucleotide content , providing immuno - modulation , enhancing flavor and palatability is proposed . the method comprises a food functional additive / supplement and feed additive based on yeast biomass processed to enhance the bioavailability and biological activity of its components using dry micron milling with optional agglomeration . the resulting product contains all biologically active components originally present in intact live yeast . compared to existing practice , the new process is much faster , cheaper , less hardware demanding , less prone to microbial contamination , provides intact biopolymers and results in insoluble product fraction with high surface area . human food and animal feed containing such additive improves weight gains , feed efficiency , resilience to mycotoxin contamination , improves immunological status , controls intestinal salmonella and other bacteria and decreases mortality , especially at the young age , replacing antibiotics and growth promoters .