Despite its importance, B12 deficiency is remarkably common particularly among vegetarians, older adults, individuals with digestive conditions, and anyone whose body has difficulty absorbing this vitamin from food or oral supplements
No established upper limit exists because excess b12 excretes through kidneys without causing harm
Inflammation of the kidneys filtering units, called glomerulonephritis, is responsible for about 10-20 percent of the extensive kidney damage patients experience, although the affected pathway is common to many forms of progressive kidney damage
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In most cases, they improve as the body adjusts over time