glutamine increases glutathione Glutaminases regulate and oxidative stress in cancer | Archives of Toxicology The Emerging Role of l-Glutamine
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Interestingly, we have also noted improved compliance with small daily dosing into the subcutaneous tissue, as injections are relatively painless compared to the more traditional intramuscular injections

Azhar, A

They also have differences in their tissue distribution, e.g., placental tissue contains predominantly MAO-A, while platelets and lymphocytes express only MAO-B (Chen and Shih 1997
But only a maximum of 5mcg of B12 enters the bile every day (according to "Advanced Haematology" 7th edition textbook, page 60), so it seems that only an additional 5mcg would be lost daily if none was recovered
