NANO - best. shampoo. ever.
However there's been a recent formula change, the new formula has been boosted in terms of hair growth power, but it doesn't leave my hair looking as thick and shiny and amazing as it once did
EDIT - to this i should add, I emailed dr proctor about it and he said he'll probably change it back because so many people have emailed him about it. If you're a NANO user, send him an email! We need the old stuff back, for our hair's sake!