Reply To: L-arginine-2-pyrrolidone-5-carboxylate? Home / Forums / Diet and Nutrition / L-arginine-2-pyrrolidone-5-carboxylate? / Reply To: L-arginine-2-pyrrolidone-5-carboxylate? StormTrooper August 7, 2007 at 8:29 am #4694 What is it? A metabolite? Whwre is it found? Need details dude. 8) Settings