Glutamine Dosage?

My buddy had a huge thing of L-Glutamine sitting around that he gave to me for 20 bucks, so I’m going to start taking it again. It’s been about a year since I even touched the stuff, never really saw any results, but I thought I’d give it a shot again. Any recommended dosages? I know Poliquin recommends 25-30 grams for someone my size.