Posting back that I am liking the results with Viviscal so far. Huge reduction in shedding for me; better than I got when I was taking MSM. I take a daily multivitamin too, but the Viviscal has been the only addition. I am in the middle of 3 boxes I ordered directly from their site.
My thinning shoulder-length hair seems to feel thicker mid-shaft toward ends now, and I think I have less breakage also.