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In my own practice, especially if an older person has risk factors for vitamin B12 deficiency, I consider a vitamin B12 level of 200-400 pg/mL borderline, and I usually order a methylmalonic acid level as a follow-up

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While it is known that B-vitamin supplementation effectively treats hyperhomocysteinemia, there is a need for well-designed, large trials to evaluate the effect of B-vitamin supplementation on long-term outcomes, such as age-related cognitive decline and the incidence of Alzheimers disease

Vitamin B12 is an essential nutrient that plays a key role in energy production, brain function, and red blood cell formation