Registered dietitians explain what vitamin B12 is, how much you need, and the potential side effects of taking too much. Reviewed by Dietitian Alyssa Pike, RDN Reviewed by Dietitian Alyssa Pike ...

Here’s what happens. Health risks of consuming too much B12 The chances of vitamin B12 toxicity from B12 are rare; there can still be risks with high doses, particularly from supplements.

For instance, you can get 6.9 micrograms of vitamin B12 in a lean beef steak. Too much red meat can raise your chances of certain health conditions and diseases. That includes heart and blood ...

Your doctor will give you the right dosage of vitamin B12 supplement, especially if you will inject it. Taking too much can cause side effects like nausea, headache, dizziness, and, in some cases ...