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This is called dual therapy, and it is one of the more powerful tools in our clinical toolkit

Vitamin B12 injections deliver methylcobalamin or cyanocobalamin directly into muscle tissue, bypassing the digestive tract

Available from: Concurrent Administration of COVID-19 and Influenza Vaccines Enhances Spike-Specific Antibody Responses - PubMed [Internet]

Are B12 Patches as Effective as Injections No, B12 patches are not as effective as injections because injections go directly into the muscle and provide full absorption

Using a serum B12 test in a patient on B12 injections to confirm B12 levels are replete is incorrect, but it happens