That structural gap is one reason the evidence base looks the way it does
Figure 2 Vagus nerve The vagus nerve is the main nerve of the parasympathetic branch (96), which can participate in taste sensation and innervate most organs, including the liver, stomach, and pancreas, and regulate circulation, breathing, and digestion by conducting sensory impulses in organs, particularly those controlling the activity of the heart muscle, glands, and smooth muscles (97, 98)
Effects of L-carnitine on phospholipids in the ischemic myocardium
[3] A common repletion strategy in profoundly deficient adults involves 100,000 IU intramuscularly every four weeks for two or three doses or a one-off 300,000 IU injection followed by oral maintenance