Glutamine was used by weightlifters for years for muscle tissue repair, I used it too, but more recently in 2012 I was given several boxes of Juven by my radiation oncologists staff, maybe the dietician, during chemoradiation treatment for tissue healing for mucocitis, neuropathy. It's main ingredients are Revigor, and amino acid's Arginine and Glutamine. It tasted pretty neutral, at least the punch flavor, comes in individual packets, and mixed easily with water, but it should not be used as a sole source of nutrition like Glucerna or Ensure, just supportive to a balanced diet. I have Glutamine powder alone also, there are many brands, and tastes pretty nasty. You can also use it for a mouth rinse and or swallow. I wouldn't say it's an answer or cure all for everything, just another product for your arsenal.

Hope this helps.