How much Glutamine you should take is based on body weight, activity, lifestyle stress, overall health and diet. Recommendations on the amount of L Glutamine to take vary between 2 grams daily up to 40 grams daily. Very high Glutamine intake a day is usually recommended for people with cancer or serious burns victims. Some bodybuilders take as much as 40g a day but this can cause stomach upsets. For the majority of people anywhere between 2-15g per day is about the amount recommended across sites on the internet. It’s best to see how you go with different supplements, start out taking 2 grams a day and then up it bit by bit seeing how you feel, I personally wouldn’t go much above 10g per day. If you notice any stomach problems cut it back down, listening to your body is the key when taking any supplements.
As well as how much you should be taking you need to know when to take it for best results. The best times to take Glutamine are pre and post workout or before bed. Break your intake up into three sittings one pre workout, one post and one before bed.