Vitamin B12, a water-soluble vitamin, plays a crucial role in various bodily functions, including the formation of red blood cells, neurological function, and energy metabolism
In women with confirmed deficiency, milk levels are typically less than 100 pmol/L (135 ng/L).[9,12,39] A lower milk level threshold of 310 pmol/L (420 ng/L) for adequate infant B 12 intake has been suggested.[28] Three mothers in India with vitamin B 12 deficiency due to very low dietary intake were given a single 50 mcg intramuscular injection of vitamin B 12
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)
Plasma B-vitamins and one-carbon metabolites and the risk of breast cancer in younger women