What is the RDA for Vitamin B12 in older adults?

The Recommended Dietary Allowance (RDA) for Vitamin B12 in older adults is 2.4 mcg/day. This amount reflects the needs of adults, including older individuals who may require this vitamin to maintain appropriate neurological functions and red blood cell formation.

Vitamin B12 plays a crucial role in the metabolism of every cell in the body, particularly affecting DNA synthesis and regulation, as well as fatty acid and amino acid metabolism. It is particularly important for cognitive function, which can be a concern for older adults.

Older adults may have difficulties with absorption due to decreased stomach acidity and other factors that can affect nutrient absorption, making adequate intake essential. The established RDA is based on current research that considers these physiological changes and the overall health of older adults.

Other options provided do not align with current guidelines for the RDA of Vitamin B12, reflecting either lower amounts insufficient for maintaining adequate health or suggesting needs not supported by research for older populations. This further clarifies why 2.4 mcg/day is the correct and recommended intake for this nutrient among older adults.