methylglyoxal is then converted into two different products, either d-lactate, and l-lactate. methylglyoxal reductase and aldehyde dehydrogenase convert methylglyoxal into lactaldehyde and, eventually, l-lactate. if methylglyoxal enters the glyoxylase pathway, it is converted into lactoylguatathione and eventually d-lactate. both d-lactate, and l-lactate are then converted into pyruvate. the pyruvate that is created most often goes on to enter the krebs cycle (weber 711-13).