Cholesterol stimulates the cellular uptake of L carnitine by the carnitine organic cation transporter novel 2 (OCTN2) Journal of Biological Chemistry 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 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. According to a study published in Clinical Therapeutics, in people with type 2 diabetes and high cholesterol, taking L carnitine (1 gram twice daily) for 6 months significantly lowered lipoprotein(a) a genetic,