I bought this halfway through May in my Space.NK haul and I've been using it every night since. It says to use it daily by pumping the serum into your palms and running it through your hair before bed.
the serum isn't thick and creamy like I thought it would be - instead is very watery which makes is easier to apply and distribute into my hair.
I use about 2 pumps every night (if you have very fine hair it says to use this twice a day) and although I haven't noticed a difference when looking at my hair, I do know that my hair has become a little thicker. How do I know this you ask? Well I notice the thickness difference when I tie my hair up as before I had to tie the hair bobble around quite a few times, whereas now I don't have to do it as many times before my hair stays up.
It takes a while for the hair to become thicker so don't expect it to happen over night. I'm glad I bought this, and even though the price is a little steep for such a small amount of product (£22.50), a little really goes a long way. I've barely used 10% in the past 3 and a half months.
Have you tried this? Are there any Bumble & Bumble products you've tried before?