I had a really bad time back in 2007 when I started losing hair. I looked up a number of available options and discarded 'Regaine' as it did not seem to provide any sustainable benefit judging by its description. So I decided to try Foltene and it really did work. My hair thickness was restored and stayed normal even after I stopped the Foltene course (I initially used both the shampoo and the after-shower treatment). Since then I have been regularly using Foltene shampoo, probably every quarter, but not too often. I actually buy a bottle of shampoo every time I see a sign of thinning hair. I only used the 'treatment' liquid once more since 2007, I think they have changed the formula since then and it seems to be quite strong now as my skin gets red and burning after application. Luckily I don't need this strength of the treatment, so I stick with just a shampoo. Works perfectly for me, I highly recommend this product.
Update May 2013:
Well, Foltene have decided to change their shampoo formula, and not in a good way. They have added some 'capsicum extract' which made it altogether a different product. In plain English that means they just added some chili pepper to it.. One thing it does better now - it foams easier. The rest went downhill. The odour is not nice, it leaves the effect of a hair conditioner as it does not wash out properly and I am completely unsure whether it had any positive effect on the hair growth. Will be writing a complaint to Foltene as I cannot use their product anymore having been their loyal customer for 6 years..