I have been taking viviscal since Jan. 1 of this year. I see a big difference with my nails and my body hair, but I have not seen much of a difference with the hair on my head. My growth rate is about the same and it is not noticeably thicker. I did grow new edges or re-grew edges I had unknowingly lost at some point over the years, but I don't know if that is the viviscal or it would have happened anyway. I will not repurchase when the boxes are done in November.
I also take MSM, B-complex, vit. D, and iron. When I run out, I intend to switch to liquid iron and vit. D and get the rest from my food.