Metformin is a medication taken for diabetes. It not only reduces the amount of glucose produced by the liver but also increases the insulin absorption capacity of cells. Lipid and triglyceride levels are also reduced by this medication.

However, a major problem with Metformin is the fact that it may alter the way the body absorbs Vitamin B12. An alteration of the mechanism of Vitamin B12 absorption, although not known well, can lead to lower levels of this all important vitamin in the body leading to various other health issues.