A group of charities have issued a warning about 'over-hyped treatment claims that sell false hope' that can be found on the internet.
Sense About Science, the Multiple Sclerosis Society, Motor Neurone Disease Association, Alzheimer's Society and Parkinson's Disease Society said websites had brought "masses of advertising, surreptitious promotion and misleading stories".
The charities have published advice on differentiating between genuine and non-genuine information.
Sense About Science managing director Tracey Brown said: "We've been contacted by so many people exhausted from the pressure they feel to try advertised treatments, dietary regimes and exercises.
"One person told us how the last years of his wife's life were spent endlessly pursuing new treatments, from goats' blood serums to unlicensed stem cell treatments abroad, all to no avail. This guide aims to help patients and their families to evaluate the treatment claims they are bombarded with."
Parkinson's Disease Society director of research Kieran Breen added: "It can be tempting to believe personal stories of miracle cures, but only by using tried and tested methods can we move forward and provide people with Parkinson's with the best available advice and treatments."