of AOAC (2006). Although it is a sensitive technique, MBA suffers from poor selectivity and often results in overestimation by 5– 30% since the test organism can react to compounds other than vitamin B12 forms, such as analogues and nucleic acids (Ball, 2006). One such inactive corrinoid for humans has been identified as pseudovitamin B12, which is produced by Lactobacillus reuteri CRL1098 (Santos et al., 2007). This corrinoid has adenine instead of DMBI as the lower ligand. In meat products, vitamin B12 con- tents were up to 2.2-fold higher with MBA compared with high performance liquid chromatography (HPLC; Guggisberg, Risse, & Hadorn, 2012), reflecting the poor specificity of MBA. Moreover, MBA is labour intensive and time consuming.