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SpectraZyme Gluten Digest from Metagenics is a dietary supplement that may support the enzymes in a healthy digestive system that digest wheat, barley, rye grains, and other gluten sources. The main ingredient in this supplement, prolyl endopeptidase, an enzyme that belongs to a class of serine peptidases, which are non-essential amino acids and support the normal breakdown of proteins and amino acids found in gluten.