Unique to Extreme, Glutamine Complex Capsules are a complex amino acid capsule containing free form and peptide bonded glutamine, they also contain another 17 amino acids in peptide bonded chains. The reason they are made this way is to ensure a large proportion of the glutamine makes it to the destination you want, your muscle cells. Glutamine is paramount in aiding recovery and promoting muscle growth and strength gains, it is also the major amino acid required to construct the stomach lining, this is why normal free form glutamine DOES NOT make it through to your muscles. But it is needed to keep your intestines healthy, that is why Extreme combine both even though producing free form glutamine is much cheaper and easier to produce.