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l-carnitine function in body Carnitine Deficiency: What Is It, Causes, Symptoms, and More l-carnitine: Nutrition, pathology, and health
Description
J Natl Cancer Inst 84(17):1306-7, 1992

Again this is rare and likely has more to do with preservative and other things in the injection other than cobalmin since our bodies need this molecule to survive
This is the standard of care for clinical peptide therapy

This means that a supplement label might claim 500mg of glutathione, but your body may only receive a fraction of that
