Adenosylcobalamin refers to adenosylcobalamin tablets and methylcobalamin is methylcobalamin tablets. Adenosylcobalamin tablets and methylcobalamin tablets are different in terms of structure, application scope and efficacy. 1. Structure: Adenosylcobalamin tablets are composed of adenosine groups, while methylcobalamin tablets are mainly composed of methylcobalamin. 2. Application scope: Adenosylcobalamin Tablets are mainly used for the treatment of megaloblastic symptoms caused by vitamin B12 deficiency, while Methylcobalamin Tablets are mainly used for the treatment of peripheral nerves and central nervous system lesions. 3. Functions: Adenosylcobalamin tablets can improve anemia symptoms, promote the repair, generation of red blood cells, but also can prevent the central nervous system damage caused by anemia, and methylcobalamin tablets can better repair the central nervous system and peripheral nerve lesions. If the use of drugs, should be under the guidance of a professional doctor as well as the individual’s own situation standardized use, to avoid adverse consequences on the body.