If you eat meat, fish, eggs or dairy, you can usually get enough B12 from food, as the NHS notes that adults need about 1.5 micrograms a day
Unfortunately, many people are vitamin B12 deficient, especially those who follow a vegetarian or vegan diet
Low levels of Vitamin B12 are rare in most healthy adults because the human liver stores it over time
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doi:10.1111/j.1365-2125.2007.02938.x