However, "unlike most other vitamins, B12 is stored in substantial amounts, mainly in the liver, until it is needed by the body," according to Merck Manuals Consumer Version
Some payers bundle the administration code differently, particularly for office visits where the injection is incidental to the primary E/M service
Chloramphenicol What are Side Effects of Vitamin B12
Cyanocobalamin injection is commonly used for vitamin B12 deficiency related to pernicious anemia, dietary deficiency, gastrointestinal conditions, or surgeries that reduce absorption
Because methylcobalamin is classed as a nutritional supplement and is not a licensed prescription only medicine in the UK, it is not available via the NHS and is being offered more and more by non-healthcare and non-prescribing practitioners as a treatment for wellness, fatigue, and to boost energy, without making any medical claims around deficiency, and is rarely combined with a supplement of adenosylcobalamin
The results of vitamin B12 supplementation differ from person to person