I use glutamine and creatine for weight training (I am a world class masters drugfree powerlifter, also training for bodybuilding). The two work together for muscle recuperation after hardcore weight training. I started on creatine first, effects were dramatic at first (my bench press and squat shot up like I was on 'roids', then the effects leveled out. Then I added glutamine, got more out of it. With creatine (5-10 grams/day), glutamine dose is one gram per gram of creatine, taken with the creatine. By itself, glutamine dose is 20 grams/day (thats why it is good to take with creatine, they help each other). If not already taking it, try creatine first, it is cheap. Load up the creatine at 20 grams/day (split in 5-10 g doses) for 4 days, then dose at 5 to 10 grams daily. You may be very satisfied with the results. If wanting more, add the 1 gram glutamine with each 1 grams of creatine. The glutamine costs more, still relatively cheap.
Note that glutamine is typically side effect free, creatine can cause water retention and possible weight gain.
Some people say that you should 'cycle off' at times for one month periods, this is debatable.
Always buy brand names, the 'off brands' often have questionable ingredients and quality.