What is the Daily Value for B-12 and can it be toxic?
The Daily Value for B-12 is 6 mcg per day, however higher amounts of vitamin B12 are needed for many people who are at risk for vitamin B12 deficiency. There have not been any reports of toxic effects from the use of B-12 even at high concentration. The No Observed Adverse Effect Level (NOEAL) of B-12 is 3000 mcg.