Optimal Absorption, Intestinal Health. Faster Uptake of Amino Acids. Superior to L-Glutamine. ProBonded Glutamine is a natural source of Glutamine in which the Glutamine is either connected to other amino acids on an oligopeptide chain or covalently bonded to other amino acids. A synthetic free amino acid, L-Glutamine has shown to be unstable in the presence of heat, water, acid or base solutions, making L-Glutamine impractical to utilize in all but powdered food preparations. ProBonded Glutamine is stable in aqueous solutions for prolonged periods of time. ProBonded Glutamine can be used in all liquid and semi-liquid food preparations. What that means to you is faster recovery, quicker muscle growth, and less muscular soreness with this great product!