I have sort of a long story with the oral GSH. We did use it for 2 years and it took about 3-4 months before we saw any changes and then it seemed to be working great for about a year and a half. Then our daughter started having all sorts of GI issues and we stopped it. She is now doing great again so opted to not use the oral. Others have not had this happen, though, and it could be completely unrelated to the GSH. I do think GSH is a very good thing. The oral just didn't seem to help anymore and it's a real pain keeping up with the doses. We would have continued if we felt that it was doing good. We do still do the inhaled b/c it seems to help with her sinuses. She does still grow PA even with the GSH though. So, who knows. But, you should definitely give it a shot because there are some pretty amazing stories of people using oral GSH. Best of luck.