How much B-12 is needed for a 71 year old female?

Hello. Thank you for posting.

*Between 10 and 15 percent of seniors over 60 years old have low levels of vitamin B-12, say scientists from the U.S. Department of Agriculture's Human Nutrition Research Center on Aging. Vitamin B-12 is required by the body for energy metabolism, to support the function of the immune and nervous systems, and to synthesize red blood cells. Seniors who lack vitamin B-12 may be more likely to develop heart disease, breast cancer, pernicious anemia and age-related macular degeneration. The Food and Nutrition Board recommends that people over the age of 50 need 2.4 micrograms of vitamin B-12 daily, ideally from a combination of vitamin B-rich foods and dietary supplements.

Helena