More recent meta-analyses of prospective cohort studies in older adults have not found a relationship between blood cobalamin concentration or dietary vitamin B 12 intake and cognitive decline or dementia (80, 81)
Maternal vitamin D status and adverse pregnancy outcomes: a systematic review and meta-analysis
B12 is critical for cell division and organ formation, especially during the rapid cell growth of the first trimester [*]
However, there are also cases when additional factors such as lack of sleep, poor diet, and deficiency of other vitamins like iron, folate, and others, contribute to the issue
What are the potential benefits of MIC B12 injections
Because of this and the small daily requirements, it can take a year or longer of insufficient vitamin B12 intake to develop an overt deficiency (1)