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Other risk factors include age, digestive issues like Crohns disease, or medications that interfere with B12 absorption

A recent systematic review and meta-analysis of 21 randomized, placebo-controlled trials examining the effect of B-vitamin supplementation found the supplementation decreased homocysteine concentrations and improved measures global cognitive function but had no effect on individual measures of executive function, information processing speed, or episodic memory (89)

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Is vitamin B12 deficiency common in vegetarians or vegans