Isn't 1000 mcg of b12 required for a week ? I read a lot that if you take one 1000 a day, it's for a short period of time only (15 days to 2 months) if you have a deficiency.
Hi, the body takes the B12 it requires and the rest is safety excreted. The reason we use a high dose in a sustained release tablet is to allow the body the best chance of getting the amount it requires. Once your B12 status normalises, it is correct that this level of B12 can be taken weekly rather than daily to maintain the status.