Learn more about how much vitamin B12 is too much. Vitamin B12 plays many crucial roles in the body. ... While megadoses of up to 2,000 mcg are considered safe in treating B12 deficiency, ...

Many vitamin B12 supplements contain much more of the vitamin than the body needs. No research has yet found any side effects from taking too much vitamin B12. Learn more here.

Though it is not proven to be toxic, there is an average recommended around 2-2.4 mcg of vitamin B12 per day. If you're a pregnant mama or breastfeeding , the average dose should be between 2.6 ...

It is highly unlikely that someone could take too much B12, says Natalie Allen, ... For example, a healthy person taking a 500 mcg oral B12 supplement will only absorb about 10 mcg.

Taking too much can cause side effects like nausea, headache, dizziness, and, in some cases allergic reactions. Everyone needs vitamin B12, and most people get enough through their diet.

The safe upper limit of folic acid for adults is 1000 mcg from fortified foods and supplements. Taking more than that could conceal the signs of a vitamin B12 deficiency in older people. Vitamin B12 ...

B12 supplements come in mega doses — think 500 mcg or even 1000 mcg per tablet. But the body only needs about 2.4 mcg per day (as per NIH guidelines). That’s a massive gap.

The researchers tested the effect of vitamin B12 on 58 randomly selected RAS patients who received either a dose of 1,000 mcg of B12 by mouth at bedtime or a placebo, and were tested monthly for ...