Out of curiosity I spoke to Dr Grinstein over the phone and was not impressed.The deal is that if you endorse the product you get a free supply but if you want to buy this miracle product it's VERY expensive so the sales pitch is very similar to scams on double glazing, wall painting etc which are very common in the uk. He talks about curing pd which is a load of rubbish and certainly didn't impress me.Neither am I impressed by the phd title which gives him the status of 'Doctor'.Anyhow why should natural dopamine by any better than manufactured- they are the same chemical.However if you want the natural form try boiling up a load of Faba beans and you would probably get a useful extract fairly rich in l-dopa and if not quite strong enough you could always crumble into it a tablet or two of sinemet.I don't wish to sound cynical and utterly dismissive of the beneficial effects reported on Dr! Grinseins product which has not been tested in scientific trials which would have to take into account the placebo effect and it's efficacy proved over a long period with a wide group of pd sufferers.We would all love to find a miracle cure but this shouldn't overide commonsense. I wish I could be proved wrong. David Langridge