When symptoms do occur in the context of high B12, they are usually attributable to an underlying condition rather than the elevated vitamin itself
Common side effects of vitamin B12 injections include mild diarrhea, itching, nausea and vomiting, dizziness, headaches, and hot flashes
Keeping them in a cool, dry place without abrupt temperature changes will help maintain their potency
They work as one part of a medical program, alongside diet, activity, and provider check-ins
This combination has been explored in sports medicine for its potential to accelerate recovery from injuries, enhance flexibility, and minimize scar tissue formation
This position is supported by the NICE Guideline and at the end of 2025 we launched our freely accessible Pernicious Anaemia and B12 Deficiency education programme to the NHS community