L-arginine is a conditional amino acid, meaning that is it not classed as essential from the diet, except in times of the body being under stress or illness, or during growth in childhood. A supplement is useful for those that require more than the body can obtain. Amino acids play a number of roles in the body including supporting cellular energy production, growth and repair of the body and the health of specific organs such as the heart. Note: This product is not intended to diagnose, treat, cure, or prevent any disease, nor should supplements be used as a substitute for a balanced diet. Not intended for pregnant/breastfeeding mothers or children under 18. Do not exceed the recommended dose.