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The serum test measures all B12 present in the blood, as well as all substances that are chemically similar to vitamin B12

B12 injections may be recommended for women who have difficulty getting enough B12 from food or supplements

These formats are used in qualified laboratory settings to investigate peptide biology, molecular signaling pathways, protein interactions, extracellular matrix research, cellular communication models, and peptide combination research

They are not necessarily better or worse, just different tools for different aspects of the problem