I have very thin hair. I have been surging for a week now and I am not only noticing wavy new growth but also the new growth is thicker. The ends of my hair will still be thin but I hope if I continue using surge then my hair will be a lot thicker. I originally was taking B Complex for thicker hair but didn't really notice any results in my hair but I must say my Nails look FANTASTIC people ask me all the time are they real. They are SO long and strong.