L-carnitine is a derivative of the amino acid lysine that is naturally occurring in the body. It plays a role in transporting long-chain fatty acids to the mitochondria for energy production. In the body, it is stored in skeletal muscles, the heart and the brain. It is a popular supplement with spoargininerts people and those that exercise frequently. Note: This product is not intended to diagnose, treat, cure, or prevent any disease, nor should supplements be used as a substitute for a balanced diet. Not intended for pregnant/breastfeeding mothers or children under 18. Do not exceed the recommended dose.