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In fact, there isn't an upper limit for B12, which is the maximum safe dose unlikely to cause adverse health effects

Some medicines can decrease the absorption of vitamin B12, let your doctor know all other medicines you are taking to make sure you are safe

What that means isnt always straightforward: In the Swiss study mentioned above, nearly three-quarters of primary-care docs surveyed reported using a multi-step approach (and not always the same one) when testing for B12 deficiencya practice that Miller says improves the odds of an accurate diagnosis since serum B12 levels alone dont always accurately identify a deficiency

Those seeking improved mood and cognitive function: B12 can help enhance mood and mental clarity, supporting a positive outlook