Enduro offers a wide variety of benefits but most of them stem from its ability to increase the production of Nitric Oxide in the body for 20+ hours. The two ingredients in Enduro that create this long lasting Nitric Oxide boost are L-Arginine and L-Citrulline, both of which are amino acids. Nitric Oxide will dilate the blood vessels and arteries, allowing for increased blood flow and circulation. Increasing our blood flow and oxygen in the body has a major effect on our endurance levels, helps protect our cardiovascular system and gives us a natural energy we all need. Enduro is a non caffeinated product with zero stimulants.