The only problem I can see you might have is if your child has yeast issues from all of the antibiotics. GSH can aggravate the yeast and make it worse. So, just be on the look out for symptoms...others on this message board could tell you more about that, otherwise, GSH has not harmed our daughter in the slightest and she has thrived because of it. Her lung function was already very good, but at her last check up it was at it's highest. So, you are doing your child a favor. I have yet to find anyone that can say GSH is harmful.