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Vitamin B12 can slow down memory loss a study published earlier this year in theAmerican Journal of Clinical Nutritioncompared the use of lower and higher serum vitamin B12 concentrations in aging patients and found that those whod had the higher dose performed better in memory tasks

Disease consequences of higher adiposity uncoupled from its adverse metabolic effects using Mendelian randomisation

Along with there being no reports of it causing birth defects, cancers or any other type of toxicity, Vitamin B12 doesnt even have an established tolerable upper intake level (UL), which is the amount that would cause an overdose or major unwanted side effects