Qualitee - I have been taking Viviscal, twice a day as recommended, since July 1st. I am consistent and very rarely (if ever) miss a dose. While my hair is growing - I haven't noticed any "above average" growth. However, the makers do say "improvement after 2 months of use". Allowing for variance, I should see some growth very soon, if their claim is true. I have a 3 month supply left - so if I don't see a "very noticable improvement by January 1" I am switching to Neocell or Youtheory collagen. Both of which are considerably cheaper than Viviscal.
There is a Viviscal thread you may want to check out.