l-carnitine heart disease Cardiac function and incidence of unexplained myocardial scarring in patients with primary carnitine deficiency - a cardiac magnetic resonance study Revisiting the Role of Carnitine
Description
Overview and assessment by in vitro methods

It increases stool volume and intestinal motility

Additionally, Table 4 papers focused on more detailed, molecular-level analyses of CNS changes

Understanding muscle dysfunction in chronic fatigue syndrome
