SCI-MUSCLE Defender™ Glutamine peptides are recognized to be the most bioavailable form of glutamine available and are estimated to be absorbed at a rate that is approximately double that ofequivalent amounts of free form L glutamine. The digestive tract has peptide transport systems that allow peptides to be better absorbed and better utilized than free form amino acids like L glutamine. Glutamine peptides may also be the answer to what scientists call the glutamine paradox. Glutamine has numerous possible benefits, but the paradox is that a large majority of ingested free form L glutamine does not actually make it into the blood stream and get into the muscle tissue. With glutamine peptides having a much higher rate of absorption, the benefits are more likely to be realized; hence the glutamine paradox may be solved.