Carnitine: the claims and why it may not work L Carnitine for Weight Loss: How It Works, Dosage & Best Supplement Zeelab Pharmacy ? That was me I don't know if it's age or just life, but lately I've been feeling tired all the timeeven during Targeting Skeletal Muscle Dysfunction With L Carnitine for the Treatment of Patients With Chronic Obstructive Pulmonary Disease In Vivo The bright and the dark sides of L carnitine supplementation: a systematic review Journal of the International Society of Sports Nutrition Springer Nature Link 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.