Nitric oxide is a signaling molecule your body produces that helps regulate blood flow, blood pressure, and oxygen delivery to tissues. Certain amino acids—primarily arginine, citrulline, and citrulline malate—serve as building blocks your body uses to manufacture nitric oxide. This category covers how these amino acids work in the body, what research shows about their effects on circulation and exercise performance, and how they differ from one another in structure and how your body processes them.
The articles here answer practical questions: which amino acids are most studied for nitric oxide production, what doses appear in the research, how long effects typically take to appear, and what the evidence actually shows versus what remains speculative. You'll also find information about food sources of these compounds and how they compare to supplements.