Found some info on this! This is from ProteinFactory.com's website. They sell both L-Glutamine and Glutamine Peptides but say that the Peptides are better absorbed because they are a smaller molecule. On the down side, they apparently taste far worse than regular glutamine. Maybe that's why they are often sold as pills instead of powder.
Heres the detail:
Quote:
Glutamine Peptides in Layman's Terms
To understand the differences in glutamine peptides and regular glutamine, one must first obtain the knowledge of exactly what are peptides and how they are different from free form amino acids. Peptides are amino acids broken down into their smaller more digestible form using the hydrolyzation process. Only hydrolyzation can produce the smaller peptides, superior to free form amino acids and larger peptides currently found in your whey proteins that are produced NOT using the hydrolyzation method. The supplement companies make it sound difficult because there is a small amount of peptides that occur naturally, regularly commercially produced whole-protein supplements. Unfortunately, what the don't tell you is that these are the larger peptides with a high molecular weight, which is different from smaller di and tri peptides that are produced using the hydrolyzation method.
Several studies have shown that smaller peptides are better absorbed than larger peptides and regularly manufactured protein.
1. Amino acids from peptides are more readily absorbed than free-form amino acids, thus producing a greater insulin reaction.
2. Humans fed smaller peptides compared to whole-protein foods had a greater increase in amino acid levels.
3. Hydrolysated products produce greater pharmacological effects (increasing GH and insulin response).
4. OLIGOPEPTIDES are LARGER PEPTIDES, which are absorbed much SLOWER than small tri and di peptides. Supplement companies try to use the word "oligopeptides" to fool the customer with scientific mumbo-jumbo when they're actually stabbing themselves in the back!
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ProteinFactory sells a formula of glutamine peptides with carbs derived from pineapples, which they claim hides the bad taste.
Hope this helps clarify this issue.