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
Blunted or impeded therapeutic response to vitamin B12 may be due to such conditions as infection, uremia, drugs having bone marrow suppressant properties such as chloramphenicol, and concurrent iron or folic acid deficiency
Results vary based on individual metabolism, dosage, frequency, and lifestyle habits
You should get B12 shots weekly to monthly for maintenance and IV infusions monthly to quarterly for broader wellness support, though frequency depends on deficiency severity, health goals, and your providers recommendation
The absence of IGF-1 elevation and glucose metabolism impairment represents a significant safety advantage for long-term applications
