A Guide to L Carnitine on Keto Keto Nutrition Nature's Truth Acetyl L Carnitine HCL 1000mg, 30 Capsules, Non GMO, Gluten Free ALCAR Supplement Walmart.com L Carnitine CAM Cancer Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window L Carnitine plays an important role in the larger metabolism equation: helping your body use fat efficiently as fuel. Learn more about the science on this week's post on The Wellness Edit. L Carnitine Erectile Dysfunction: What the Evidence Actually Shows