The scientific community, and more specifically the cardiovascular scientific community, is getting really excited about the health benefits that are being discovered by those who are choosing the dietary supplements L-Arginine and L-Citrulline. Compared to other amino acids that have been being used as dietary supplements, the use of L-Arginine and L-Citrulline is a relatively recent development. However, widespread use of this supplement has yielded a number of health benefits, some that are so profound that cardiovascular disease (the number one killer of Americans) which may have before seemed imminent in some patients, can be completely reversed by the eliminations of the pre-cursor symptoms of the disease. The potential benefits of these supplements are just now being tapped into. With more years of continual amazing results and continued modification, the health improvement potential benefits are impressive and even exciting. Increase stamina and energy levels L-Arginine and L-Citrulline's effects on improving the production of nitric oxide lead to better blood flow. Better blood flow means that the heart does not have to work as hard to do its job. When the heart is not stressed, we have a greater amount of energy. We also have improved stamina when nitric oxide levels are at their best because it takes less effort to tire the heart. The heart is a large determinant of what we are and are not able to do physically without pain or exhaustion. When we can keep our heart healthy we are able to do more towards improving overall health because we have the energy and the stamina needed. Muscle mass L-Arginine and L-Citrulline are amino acids that aid in the production of nitric oxide. Nitric oxide has recently gained a lot of popularity and hype as a supplement for different types of people; one of the biggest groups being bodybuilders. There are claims that L-Arginine and L-Citrulline supplements can help build muscles faster and stronger. There are many supplements with nitric oxide that are targeted specifically towards bodybuilders. As is the case with any drug or supplement, it is important to take L-Arginine and L-Citrulline in their recommended dosage levels. Too much L-Arginine or L-Citrulline can be dangerous as can the neglect for the need to obtain a proper balance of vitamins, minerals and amino acids. Improved immunity Improved blood flow allows for the body's natural defenses to do their jobs more efficiently. If the blood is better able to carry and distribute out immune system's blood cells throughout the body, we can fight off infections before they become an annoying or even serious health issue. The increased flow of healthy blood cells can wash out the system of contaminants which translates into faster healing times as well. Lower bad cholesterol levels Lowering bad cholesterol levels helps improve cardiovascular health. Blockage in the arteries makes the job of the heart a lot harder. The harder the heart has to work to pump blood throughout the body the more strain the heart has to endure and the less efficient it will work. Eventually prolonged levels of cardiovascular stress can lead to a number of heart problems including heart attack. L-Arginine and L-Citrulline not only help to lower bad cholesterol levels in their assistance o the production of nitric oxide, but they also aid in the increase of positive or good cholesterol levels.