Originally, the concept holds the epithelium/endothelium protection achieved against direct injury made by noxious agents by contact in the stomach, as direct cell protection, to be translated unlimitedly to the entire body [35,36,37,38,39,40,41,42]
These statements have not been evaluated by the FDA Sources:
It is a methyl-compound that the human body requires to function properly and is used mainly in the liver, brain and nervous system
Vitamins are essential for optimal brain nutrition and function, but when these vital elements are deficient, they can disrupt the brains intricate network
So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change