Ultra labs DL185 Dileucine PeptideUltra Labs DL185 contains a clinically researched natural anabolic and anti catabolic peptide composed of two leucine molecules bonded together, creating a unique, patented dipeptide structure, DL 185 Dileucine Peptide. Dileucine is a peptide consisting of two leucine molecules chemically bonded to one another that get into the bloodstream intact and can boost protein synthesis better than regular leucine and we dont mean just a little better either!