I don't know if this shampoo is growth promoting or not, haven't used it long enough but one thing I can say When I use this shampoo and the conditioner are much less hair in the drain. And when I say a lot less, I mean it's minimal. I have medium length hair, thin and lifeless, and I used to lose a lot of hair when I washed it (I had to use a strainer in the shower to keep it from clogging) - well, not anymore! Now the loss has been reduced to a few strands! I also notice that my hair looks and feels more voluminous so my hair is not styled as flat and thus my scalp is exposed so I will continue to use it as I have tried numerous other products and nothing has made my hair look as full or feel like this shampoo and conditioner. Other products had 3 stages, a waiting time, etc., it was a one time wash and clean up and the difference was amazing when I used it for the first time! I would be happy if it stimulates new growth or faster growth but it will be a while before I notice, less hair in the drain was noticed on the first wash and less hair loss - even combing, and the fullness helped with the problem of the bare scalp and is worth buying for that alone!
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