... .Rich in nucleotides, nutrition of peptidea, glutathione, etc Autolysis Yeast Powder (Feed Grade) GSZ-221 Appearance : odor light yellow or yellow brown ... enzymes, enchance digestion and absorption rate, which can effectively improve feed efficiency.Rich in nucleotides, peptides and polysaccharides, such as immune ... . Seal it after use and keep moisture proof. Autolysis Yeast Powder (Feed Additive)