Most healthy adults have a heavy store (up to several years worth) of B12 in their liver
Some define elevation as a value at or above 1,000 ng/L, which is the same as 1,000 pg/mL and roughly 738 pmol/L, while others set the bar at more than 1,000 pmol/L, closer to 1,355 pg/mL

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Persistent high levels, particularly without supplementation, may warrant further investigation to rule out medical conditions