Acetyl L Carnitine vs L Carnitine: 4 Key Differences Momentous Acetyl L Carnitine Olympian Labs Herbal supplements may seem safe because they are natural, but for people with chronic kidney disease (CKD), they can pose serious risks. They may harm your kidneys, interact with medications, or increase 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.