Treatment for B12 deficiency can be oral, applied under the tongue or administered through the nose, or it may require various types of injections
Vitamin B12, also known as cobalamin, is an essential water-soluble vitamin that plays a crucial role in red blood cell formation, neurological function, and DNA synthesis
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
Sodhi M, Rezaeianzadeh R, Kezouh A, Bhatt DL
Pathogenetic and therapeutical uncertainties