Here's my review:
I've been using Nioxin products in my regimen for over a year. I started out with System 3 (didn't care for it), used it up then switched to 7. Then when I ran out of System 7 shampoo and repurchased the #5 shampoo since I stopped relaxing my hair last year. (Systems 5 and 7 work better for our hair, IMO. They are more moisturizing and lightly detangle) Anyway, the shampoo and conditioner stopped my scalp issues leftover from relaxers and keeps my scalp clean and calm. The Follicle booster has filled in my edges and sides tremendously, I mean like a huge difference. My hairdresser even commented when I came in to get my hair cut a year after she recommended I use this. I stopped using it for a few months due to laziness, but have resumed in the past couple of weeks because I want to see if my sides will fill in completely (I had some small but severe scalp burns as a child). So yeah, if you stick with the products, they work. I use the Nioxin shampoo as a first lather to my normal shampoo (L'anza Healing Moisture) and apply the conditioner directly to my scalp before putting regular conditioner or deep conditioner on my hair, then rinse everything out very thoroughly. I want to get the #5 treatment to use as well.
IMO even if someone doesn't have thinning but they style their hair alot, they should use Nioxin. The line is really good about keeping the scalp healthy since it deserves as much attention as what we give the skin on our face. It's expensive but you really don't need to use a lot at once to get results.
HTH
A.