Carnosine is a multifunctional dipeptide made up of the amino acids beta-alanine and L-histidine. It is also a naturally occurring antioxidant and potent glycation-inhibiting nutrient. Carnosine is found both in food as well as the human body. Long-lived cells such as nerve cells (neurons) and muscle cells (myocytes) contain high levels of carnosine. But carnosine levels decline with age, making supplementation an essential part of your whole-body health program.