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The timeline varies based on individual factors including starting point, dosing, diet, and exercise habits

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)

On average, vegetarians have lower iron stores than meat-eaters, but this might be largely a function of reduced inflammation

As an injectable vitamin B12 solution, methylcobalamin bypasses the digestive system and allows direct absorption, making it a popular option for individuals with low or deficient vitamin B12 levels