Compare cyanocobalamin with Methylcobalamin for Vitamin B12

What is the difference between cyanocobalamin and methylcobalamin?

This doesn't only mean that cyanocobalamin is a less efficient way to supplement your vitamin B12 intake. You also face the problem of what happens to the cyanide group that is liberated during conversion into the 'active' (useful) form of B12 i.e. methylcobalamin.Aug 6, 2013

Info Source: http://www.methylcobalamininfo.com/methylcobalamin-vs-cyanocobalamin/