What an elevated serum B12 represents, and why no single threshold exists A serum B12 reflects vitamin bound to transport proteins in the blood, not the amount that has reached the tissues, and the threshold for calling it high shifts with the assay, the laboratory, reference interval, and the unit on the report
Found naturally in meat, poultry, eggs and milk, Vitamin B12 is also a key component of many oral vitamin supplements, aimed at increasing energy levels
Long-Term Effects For sustained benefits, regular Vitamin B12 shots may be necessary, especially for those with chronic deficiency or absorption issues
O'Leary F, Samman S
B12 testing is often performed indiscriminately as part of routine screening and can lead to unnecessary diagnostic and management quandaries