L Carnitine has become one of our top 5 sellers the last few years and when you review the research, you can see why. L carnitine is a supplement probably more well known if Understanding the Benefits of L Carnitine for PCOS Management 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. Carniphil: PCOS PCOD Problem Treatment , Endometriosis & Absence of Period L Carnitine Linus Pauling Institute Oregon State University Nutrition for Polycystic Ovary Syndrome (PCOS) Foundation for Female Health Awareness