You cant really overdo it when taking vitamin B12
Oral B12 supplementation generally takes longer to produce noticeable effects than intramuscular injections, with patients typically experiencing improvements within 24 weeks
Accordingly, we calculate the cost burden to hospitals using a wage ( plus benefits estimate of $48.32 per hour
If you do not have any of the conditions below then it is likely that your low vitamin B12 is due to your diet, in which case it is not a medical issue and can be corrected with oral supplements you can buy over the counter or online
then 5000 mcg monthly for maintenance Monitoring : You cant really overdose on B12, as its water-soluble, but I always recommend doing the initial test and retesting three months later, to track and monitor your progress
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