Z-KONZEPT L-arginine 5.000 - 100 capsulesL arginine is a sought after amino acid for athletes for two reasons. The first is the fact that although L arginine is an amino acid that the body can produce from L glycine and L methionine, it may not be enough at the time of intense training or dieting and in stressful situations. Therefore, it is appropriate to provide the body with this semi essential amino acid to support protein metabolism. L arginine is also the only precursor to nitric oxide