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 ...

Vitamin B12 is essential for red blood production, DNA synthesis, and nerve health. However, excessive intake, particularly from supplements, can lead to skin reactions, kidney issues, nerve ...

Vitamin B12 levels within the normal range may still affect brain function, raising questions about current nutritional ...

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 ...

Share on Pinterest Scientists have found a link between B12 levels and cognitive health in older adults. Milan Markovic/Getty Images Vitamin B12 is needed for the development and function of nerve ...