TWINLAB L-Arginine is a supplement of free-form amino acid required by the body to produce creatine and urea, an excretory product essential for elimination of toxic ammonia from the body system. Although the body normally produces adequate L-arginine, sometimes it is necessary to supplement this with further amino acid. Arginine is an indication of nitric oxide, which relaxes blood vessels and makes a significant contribution to protein manufacture.

Each dose has 500 mg of L-arginine. This supplement contains no tablet binders, coatings or added flavorings, and is free of salt, artificial sweetener, coloring, preservatives and salicylates.