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These cells secrete a substance, mysteriously known as intrinsic factor, that promotes vitamin B12 absorption from the digestive tract

The compound appears to have linear kinetic behavior in mouse plasma with a half-life of 5.7 h

A body might react adversely to B12 shots for a variety of reasons

In cases of chronically sustained Type II GPCR activation, -Arrestins can induce the internalization of the GPCR through clathrin-mediated endocytosis, insulating the receptor from extracellular signals

Like amino acids, peptides occur naturally in the human body, including within the hormones and neurotransmitters that regularly circulate within our tissues [3]