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Enabling healthful aging for all the national academy of medicine grand challenge in healthy longevity
There is no direct human evidence
Why Vitamin B12 Matters for Nerve Health Vitamin B12 (cobalamin) is an essential water-soluble vitamin required for: Myelin repair (protective coating around nerves) Neurotransmitter function DNA synthesis & cellular repair Red blood cell formation & oxygen delivery The body cannot manufacture B12 , and deficiency is common especially among older adults, vegans/vegetarians, people with absorption disorders, and those taking drugs like metformin
Gastroenterology, 109 (2), 555563
Grimes, J
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