L Carnitine Linus Pauling Institute Oregon State University Have you read about lipoprotein (a) before? 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. Over the last few years, L carnitine has become one of our top sellers and when you look at the research, and listen to the women with PCOS who take it, it becomes