Initially , yes this makes your hair look thicker but that's just down to the clever trick of the alcohol drying and causing friction to the strands and cuticles giving the illusion of plumping hair. A hair thickening styling product does the same thing. The product has a very strong scent of alcohol. Its so concentrated. Its watery and one vial is more than enough to cover scalp. The applicator is horrible. You have to shake and shake for liquid to come out , it's so hard to get it out. It's the worst applicator I've used . Now regarding results, it hasn't made any difference. More interestingly after some research I discovered the studies behind Stemoxydine the ingredient in this promoted to help with hair growth was conducted for by biolages company loreal. There are limited independent studies to show any actual benefit. The only 'evidence' was done by the brand selling it. Not exactly trustworthy. Compared to other ingredients like minoxidil or anagain , Stemoxydine has actually been shown to be the least effective.

I’ve only been using half a bottle because I’ve read previous reviews saying makes the hair feel like it’s full of product. But so far using half the bottle my hair feels ok 

Not used it yet but hopefully works as well as the shampoo and conditioner does

The product description isn't quite clear: The box contains 10 bottles, and you've to apply one per day. The treatment course is supposed to be 90 days, so you will need at least 9 boxes if you wish to complete the treatment course. I've so far tried one box, I find it makes my hair look and feel like it has too much product in it. I tried using just half a bottle on a couple of days, but it was still too heavy. I won't be completing the treatment course, because I don't like the look of my hair, and haven't seen enough improvement to justify a further 8 boxes.

I have been using this every time I wash my hair and I have started to notice a slight difference. More that my hair is feeling stronger, not thicker. I think with regular use and over time this will help my hair come grow thicker and stronger as I have noticed less breakages when brushing.