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Description
This could be due to racial differences in B12 metabolism, or in environmental factors, most obviously diet (B12 intake)

With 240 capsules per bottle, these tablets provide a long-lasting supply

Cysteine transamination and 3-mercaptopyruvate sulfurtransferase Although 3-mercaptopyruvate (the keto acid of Cys) is a good amino acceptor for transamination reactions, Cys is a poor amino donor for transamination reactions catalyzed by aspartate aminotransferase or other aminotransferases (reaction 6)

Parthiban, V., Gromiha, M
