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Vitamin B12 deficiency can lead to many conditions
plasma ester concentrations peak within several days and then decline with an apparent half-life of approximately eight days, yielding biologically active estradiol levels that can persist for three to four weeks after a single injection
For hematocrit and reticulocyte counts, recommendations are to repeat these tests daily from the 5th to 7th days of treatment and then frequently until the hematocrit returns to a normal range
Storage matters too
B12 alone is not a reason to pursue broad imaging or invasive testing absent these supporting signals
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