Studies suggest it may lower markers of muscle damage, like creatine kinase, after intense exercise
[7] When twenty active, resistance trained-males were given 2g per day of l-carnitine l-tartrate and prescribed a high-carbohydrate diet (which, interestingly, included alcohol!) and measured for two weeks of exercise, they noticed no change in oxidation of carbohydrates, nitrogen, BCAAs, or plasma urea, as well as no change in fat, carbohydrate, or protein metabolism between baseline measurements, and no difference between the supplemented group and the placebo group
Glutathione is a tripeptide that is synthesized from glutamate, cysteine, and glycine through two ATP-consuming reactions
This characteristic may be beneficial for individuals seeking to increase caloric intake (such as in clinical wasting scenarios) but is often unwanted in body composition optimization protocols
Gastroenterology 128, 636641