L-Arginine is a natural, simple amino acid that is popular among bodybuilders to promote blood flowing to the muscles for a better workout. Easily digestible, this versatile amino acid works as a precursor in the synthesis of glutamate, polyamines, agmatine, proline, creatinine, and urea. â?¢antibiotic free â?¢gluten free â?¢all natural Product Ingredients/Materials L-Arginine (Base), L-Arginine AKG 2:1 Extract, L-Citrulline HCL, L-Citrulline Malate Extract, Beta-Alanine