A female asked:
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can you overdose on vitamin b12? is it safe to take 16000 mgs

1 doctor answer
Dr. Gurmukh Singh
48 years experience Pathology
How often?: There are no known illeffects from overdose of vitamin B12, but you would be wasting your medication and money. If you need to take vitamin B12, you should take it as an injection and and injection of 1000 micrograms (not milligrams) each month, is more than enough.
Answered on Mar 6, 2018
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