> what kind of skin problems cleared up

Little Acne bumps and small excema type red acne, most prevalent on my forehead. To control these I previously used a benzyl peroxide 2.5% solution, but now I no longer have to or at least use a lot less often and don't apply nearly as much. The overall "smoothness" or "tone" of my facial skin improved in a few days time.

> how much did you take per day

I started out taking about 4 grams per day. This was sufficient to notice skin clearing effects. I later upped the dose to apx 15 grams per day (3 x 5 gram). The dosage on the glutamine powder I bought claimed the theraputic max was 40 grams per day under the supervision of a physician. The higher dose relieved a "tight" feeling I've had for a while under my left ribcage.

> with food or without

Without food on as empty stomach as possible. I mixed it in with 500mL spring water bottles and drank between meals. I also had a dose just before bed.

> did you notice any negative effects from it like insomnia

No, this was never an issue for me.