Short chain fatty acids in control of body weight and insulin sensitivity Nature Reviews Endocrinology Frontiers Ameliorating effects of L carnitine and synbiotic co supplementation on anthropometric measures and cardiometabolic traits in women with obesity: a randomized controlled clinical trial Hypertension and Insulin Resistance Hypertension Frontiers The effects of L carnitine supplementation on glycemic markers in adults: A systematic review and dose response meta analysis 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.