MS as you might know, the debate about glutamine will never end; however, L-glutamine is absolute useless, in my view, unless you use it for its immunological boosting properties.
The simple reason for the above statement is because glutamine has to get into the blood stream one way or another.
As we know, roughly 61% of the AA pool in the blood is glutamine. That is approximately 5g of amino acids in the blood at one time. In addition, close to 90%(probably more) of the ingested glutamine is destroyed by the stomach acids. After the beforehand fact, it is probably safe to assume that not even 1% gets to the blood--less I imagine.
The immunological boosting properties can be explored, I am one of the people that saw this early on and started getting the "ANIMAL" glutamine created by the infamous Animal. What the major contribution in the mix is Potassium Citrate, which should act as a buffering agent. A more prominent way to do this is by adding baking soda to the mix with Glutamin; thus, creating a stomach acid buffer and, maybe, increase some absorption.