Acetyl L carnitine Cellular energy Life Extension Europe Frontiers Ameliorating effects of L carnitine and synbiotic co supplementation on anthropometric measures and cardiometabolic traits in women with obesity: a randomized controlled clinical trial L carnitine tartrate supplementation in the fight against infectious disease 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.