I have not followed Dr. Bishop's protocol largely because of expense and also because other members of this board have said it is not wise to inhale gsh if you have cepacia.
I take liposomal glutathione--1 tsp once a day. It is supposedly formulated for the body to digest better and also you don't need to take as much.
I don't know if has really helped me or not. I did not experience increases in pfts at all. I also did not experience weight gain, although I do not need to gain weight in the first place. (I am 137 lbs at 5'4 3/4")
I did notice that the gsh gives me extra energy. I stopped taking it at one point and realized I felt better with it.
Hope this helps,