Nitric Oxide Synthases (NOS) are enzymes responsible for producing nitric oxide (NO), a crucial signaling molecule in the body. There are three main types of NOS: neuronal NOS (nNOS), endothelial NOS (eNOS), and inducible NOS (iNOS). Each type is found in different tissues and has distinct roles, such as regulating blood flow, neurotransmission, and immune responses. Nitric oxide plays a vital role in various physiological processes, including vasodilation, which helps regulate blood pressure. By converting the amino acid L-arginine into NO, NOS contributes to maintaining cardiovascular health and facilitating communication between cells. Dysregulation of NOS can lead to various health issues, including cardiovascular diseases and inflammation.