Methylcobalamin is a type of vitamin B12 that is commonly used in dietary supplements. It is an essential nutrient that plays a crucial role in the production of red blood cells and the maintenance of nerve function. While methylcobalamin is the most commonly used name for this nutrient, it is also known by several other names, including MeCbl, MeB12, Methyl-B12, and Methylcobalaminum. These synonyms are often used interchangeably and refer to the same nutrient. Methylcobalamin is typically derived from animal sources and is particularly important for vegetarians and vegans who may be deficient in this nutrient.