I have been taking GABA that I picked up at the GNC store recently and it works great! It is a calming amino acid and helps to produce deep sleep. Also, helps to produce your growth hormons. It comes in a capsule so it was much better for me than the hard tablet that prohealth sells. My stomach can't handle the tablets. I take it with prohealth's fibro sleep and I sleep 6 hours straight! Yeah. According to dr Ginevra Liptan author of Figuring out Fibromyalgia, deep sleep (stage 3 and 4) is what we so desperately need. Most people get 45 minutes a night but fibro patients only get about 4 minutes a night! She has suffered herself with this DD and has done extensive research. GABA acts as a natural tranquilizer and calms the central nervous system. So you can't take it with any anti anxiety pills. What I did is cut back on the sleeping pills and then slowly added the GABA. I would buy pure GABA because I have found that it works better than a supplement that has other ingridients. Dr. Liptan says that pain meds, sleeping pills, and anti anxiety pills don't put you in a deep sleep even though you may think you are getting better sleep you are not. The GABA is a natural amino acid and a much more healing way to go! The muscles and joints need deep sleep to heal. This is a huge improvement for me! Also, when I was out of GABA for a short time I had to use my old sleeping method (Lunesta and ambian) on 4 different nights. The next days my pain was worse and I my mood was so depressed.... That's when I went to the nearest GNC to get my GABA supplements. What a difference this wonderful amino acid makes!