I have heard that in London a company offers 12.5% Minoxodil solution. Is this better that the 5% one- is it more effective.

The manufacturer of Minoxodil(Regaine) is the giant pharma firm called Pfizer. Currently the most powerful version of Regaine is 5%- nothing more. Aspiration Hair feels that if the inventor and original manufacturer does not offer a 12.5% version there must be a good reason for it (maybe side effects, dangerous reactions, etc.). Until Pfizer with its respected scientists and massive research and testing resources determines to offer a version of anything stronger than a 5% solution (or at least approves the usage of such a product), I would advise NOT USING IT.