Comparison of short term and long term effects of peroral L carnitine intake: clinical implications of elevated TMAO levels in cardiovascular complications L Carnitine Linus Pauling Institute Oregon State University Role of carnitine in disease Nutrition & Metabolism Springer Nature Link L Carnitine Benefits for Chronic Fatigue Syndrome If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy.