1. Can taking too many vitamin B12 and folic acid supplements hurt me?
Not usually. Since B12 and folic acid are water-soluble, the body will rid itself of any excess by excreting it in the urine. However, taking folic acid can mask low B12 levels, so it can be important to be tested for both before beginning folate supplementation. Individuals who are allergic to cobalt should not take B12, and those with the hereditary eye disease Leber's disease may experience harm to the optic nerve if they take B12
2. Should everyone have vitamin B12 and folate tests?
These tests are usually not necessary if you do not have symptoms associated with a deficiency, you do not have large red blood cells (RBCs) as determined by a complete blood count (CBC), and you do not have a disease or condition associated with malabsorption.
This article was last reviewed on April 24, 2015. | This article was last modified on April 24, 2015.
The review date indicates when the article was last reviewed from beginning to end to ensure that it reflects the most current science. A review may not require any modifications to the article, so the two dates may not always agree.
The modified date indicates that one or more changes were made to the article. Such changes may or may not result from a full review of the article, so the two dates may not always agree.