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Is 5000 mcg of B12 safe for seniors? A comprehensive guide

While the Recommended Dietary Allowance (RDA) for vitamin B12 in adults is just 2.4 micrograms (mcg), absorption decreases with age. The question, "is 5000 mcg of B12 safe for seniors?" becomes relevant when a deficiency is suspected, but it's important to understand the complexities of high-dose supplementation before proceeding.