I have to agree with Reflections, I think it's a placebo.
Either pay the money for the vision (if you genuinely think this works) or maybe, try without it for a while and see how you get on.
Let me give you an example:
I'm going bald, no denying it, I look like professor 'Pat Pending' from Wacky Races...on a bad day.
Mrs Window Cleaner works in Boots, so she got me some of this German Caffeine Hair Shampoo; it's supposed to stimulate hair growth and is bloody expensive.
So I try it. Put some on and it stings like hell. I thought it was going to burn the skin off my head.
However, next morning I look in the mirror and hey presto! I have a full head of hair.
I think I look like Brad Pitt, where in actual fact I look like his cousin 'Sess'.
Placebo.