ZMA, 90 capsstar rating 5greenthinks@msn.comNovember 28, 2006a supplement that really works. helps your sleep you dream with this stuff so vividly you swear it was real. it helps your strength and your testosterone also. you can tell that its working. the differance is noticeable. the zinc is what affects your immune system stress exercise all cause your zinc levels and therefore your testosterone to become depleted .