Disclaimer: This calculator is for research and educational purposes only
Due to the complicating factor of a shot and the extra cost, it seems the best route for most people is to focus on getting adequate B vitamins from food, and supplement as necessary.
Symptoms such as itching, swelling, or difficulty breathing should be treated as a medical emergency
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
If you suspect you've experienced a side effect from a vitamin B12 supplement, you can report it through the MHRA Yellow Card Scheme (yellowcard.mhra.gov.uk)
How to Store Your Vitamin B12 Injections