L-Arginine is an amino acid which is produced by the human body under normal circumstances. L-Arginine is critical when it comes to the production of nitric oxide which is required for a plethora of bodily functions and processes. It is also a precursor to other amino acids like creatine and glutamate. Furthermore, Arginine is vital in relation to the development of white blood cells within the body. These capsules are a handy way of obtaining good levels of L-Arginine if you are not getting enough of it through your diet. L-Arginine can be found in a range of foods including varieties of meat, fish, seeds and nuts.