Compared with cyanocobalamin, it appears that methylcobalamin is better absorbed and retained in higher amounts within your tissues.
Vitamin B12 is the common name for a nutrient known scientifically as methylcobalamin. It's used as a dietary supplement and to treat certain anemias. Vitamin B12 plays an important role in helping the body make red blood cells.
Because of the low toxicity of vitamin B12, no tolerable upper intake level (UL) has been set by the US Food and Nutrition Board.