Does L Carnitine Work for Fat Loss? A Dietitian Explains Diabetes and Glucose Control Life Extension L Carnitine 3000 Liquid L carnitine is a naturally occurring amino acid structure that is made in the human brain, liver, and kidneys. L carnitine plays a critical role in energy production, as it converts fat into energy. Acetyl L Carnitine 500 mg Medicine Center Pharmacy Superior Labs Acetyl L Carnitine 1000mg Maximum Absorption Pure Vege Cap 200 CT eBay