<prompt> Nitric acid in synthesized fromL-arginineL-citrullineLysineTrptophan  <response>: Ref-Sathyanarayana 4e p387 Dietary supplements containing L-arginine have been marketed with the purpose of increasing vasodilatation, and thus, blood and oxygen supply to the exercising muscle. The present study evaluated the acute effect of L-arginine supplementation on indicators of NO production, nitrite NO2- nitrate NO3- NOx, in healthy subjects. 