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What are the symptoms of taking an overdose of vitamin b12?

3 doctors weighed in
Dr. Kelty Baker
Internal Medicine - Hematology
2 doctors agree

In brief: Vitamin B12 overdose

Too much vitamin B12 can cause mild diarrhea, skin rashes, hives, breathing problems, heart palpitations, panic attacks, and insomnia.
The symptoms typically disappear within a few hours, as the excess B12 is flushed from the system, so no specific treatment is required.

In brief: Vitamin B12 overdose

Too much vitamin B12 can cause mild diarrhea, skin rashes, hives, breathing problems, heart palpitations, panic attacks, and insomnia.
The symptoms typically disappear within a few hours, as the excess B12 is flushed from the system, so no specific treatment is required.
Dr. Kelty Baker
Dr. Kelty Baker
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