Study Questions Vitamin B-12 Recommended Intake
Republished with permission of Natural Standards Research Collaboration ©2006

The recommended daily intake of vitamin B-12 should be more than doubled from the current level, according to the researchers of a new study.

The current recommended dietary allowance (RDA) of B-12 is 2.4 micrograms per day. However, the researchers found that six micrograms of B-12 per day is needed to prevent signs of mild B-12 deficiency.

The study, published in the January issue of the American Journal of Clinical Nutrition, looked at the relationship between vitamin B-12 consumption and blood markers of mild B-12 deficiency in 98 postmenopausal women.

Vitamin B-12 is needed to maintain healthy nerve cells and red blood cells. Vitamin B-12 is found in animal products, including meat, fish, poultry, eggs and diary.

A deficiency in the vitamin can cause symptoms ranging from mild to severe. Symptoms may include, fatigue, mild dizziness, nerve damage, anemia and dementia. Vegetarians and vegans are more likely to experience a deficiency since they do not eat animal products.

To learn more about vitamin B-12, including dosing, interactions and side effects, please visit,

Reference: Bor MV, Lydeking-Olsen E, Moller J, Nexo E. A daily intake of approximately 6 {micro}g vitamin B-12 appears to saturate all the vitamin B-12-related variables in Danish postmenopausal women. Am J Clin Nutr. 2006 Jan:83 (1):52-8.