Frontiers Role of Carnitine in Non alcoholic Fatty Liver Disease and Other Related Diseases: An Update L Carnitine The Wonder Fat Loss Miracle or Just Marketing Hype? FIT Asia Advancing Fitness Education L Carnitine L Carnitine Supplement: Heart Concerns Advanced Molecular Labs L Carnitine. Boost Weight Loss & Improve Heart Health 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.