My current recommendation when either yeast extract or autolyzed yeast extract is listed as an ingredient in foods NOT labeled gluten-free is to contact the manufacturer and ask whether spent yeast from beer manufacturing is the source.Hereâs whyâ¦.y current recommendation when either yeast extract or autolyzed yeast extract is listed as an ingredient in foods NOT labeled gluten-free is to contact the manufacturer and ask whether spent yeast from beer manufacturing is the source. Hereâs whyâ¦.
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Aspartate aminotransferase (AST) is an enzyme thatâs present in various parts of the body. An enzyme is a protein that helps trigger chemical reactions that your body needs to function. AST is found in the highest concentrations in your muscles, heart, and liver. A small amount of AST is typically in the bloodstream.