1500 mg.Solgar L Glutamine before bed on an empty stomach. Hospitals used to do Glutamine after surgery (iv) until 1959 and then it all stopped. It puts you back on your feet much quicker.Doctors worldwide still use it. Once you have had surgery or been put under your body looses the ability to make this necessary amino acid. so you take it yourself. Don't take my word please yahoo anddo the research yourself.  Don't forget pantethine b complex e (d alpha) c after surgery.  check out earthclinic.com read Ted he is brilliant and honest.  Good book on amazon is Lets get well.  Good luck and read and do the research.  Check out sodium chloride deficiency and electrolyte imballance you will be shocked.  good luck