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Vitamin B12 Toxicity Level

author image Alyssa Clement
Alyssa Clement holds Bachelor's degrees in psychology and nutrition. She has completed clinical nutrition internships in long-term care and acute care along with food service and community nutrition internships. Her research includes nutrition supplements, weight loss, exercise and sports nutrition.
Vitamin B12 Toxicity Level
Red meat contains Vitamin B-12. Photo Credit: Jacek Chabraszewski/iStock/Getty Images

Vitamin B-12 is also referred to as cobalamin because cobalt is in the chemical structure. The vitamin has the largest chemical makeup of all the vitamins. The recommended dietary allowance for B-12 is 2.4 micrograms per day. Most Americans easily meet or exceed this RDA without any ill effect. In the diet, vitamin B-12 mostly comes from meat, poultry, fish and shellfish.

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No Upper Limit

There is no known toxicity for vitamin B-12. The body absorbs only a small amount of vitamin B-12, which is why there is no toxicity. Because there are no side effects from large doses of vitamin B-12, no tolerable upper intake was ever established.

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