There's a reason L carnitine keeps showing up in PCOS research Because PCOS is closely tied to insulin resistance, inflammation, and metabolic dysfunctionand L carnitine plays a role in energy metabolism and fat utilization. Short chain fatty acids in control of body weight and insulin sensitivity Nature Reviews Endocrinology 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. Frontiers The effects of L carnitine supplementation on glycemic markers in adults: A systematic review and dose response meta analysis