To understand why GP practices sometimes differ from these guidelines and what that can mean for you, you can read more about the nuances of B12 guidelines
Note that this refers to per kg of diet, not per kg of body weight
High B12 blood serum levels can often mean: The body is having trouble converting, transporting and absorbing vitamin B12 into the cells where it's needed for intracellular and downstream processes The vitamin B12 in your serum is inactive and not able to be utilized You could also have contributing deficiencies in iodine, selenium, molybdenum, and/or B21 And it can also mean that youre getting a form of B12 in your diet (or vitamins) that is not converting well in your body for absorption (likely cyanocobalamin) Ironically, this is called a paradoxical B12 deficiency
Symptoms of deficiency, including fatigue, numbness, cognitive fog, and mood changes, may return over weeks to months
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