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Some autoimmune diseases can affect B12 metabolism or produce antibodies that interfere with B12 assays, potentially leading to falsely elevated readings
Purity should be documented, not asserted
These substances are used in small doses (mostly 1 mg anastrozole, 2.5 mg letrozole, and 12.5 mg exemestane)
Oral vitamin B12 is often considered when diet is the suspected cause
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