At 13, my son is growing like a weed and it dawned on me that I probably needed to up his dose of GSH. After doing the math per Dr. Bishop's protocol, I feel like I deserve the Bad Parent Award, because his dose needed to be substantially bumped up and has been too low for quite some time. At any rate, the dose has been corrected and I'm glad to report John's PFTs are up across the board. FEV1% went from 107 to 112, FEF 25-75% went from 128 to 142.