Hi, Lucy, thank you for your story! I do think cysteine is important for CF, though I think GSH itself is probably more important, given that CF involves a breakdown in the cellular efflux system which is the route by which cellularly-synthesized GSH makes it into epithelial lining fluids.

May I simply ask that this be the last promotional message on site? Financial gain muddies the waters, I think, for our readers . . .