New study links L carnitine in red meat to heart disease Harvard Health Supplement of the week: L Carnitine!, This one doesnt just boost fat metabolismit can also improve recovery, endurance, and even brain function. If youre serious about performance and longevity, 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. Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link