Welcome back to "Doggerel," where I ramble on about words and phrases that are misused, abused, or just plain meaningless.
This bit of doggerel is an old marketing trick that shouldn't work anymore. A patent does not indicate efficacy, only uniqueness, and sometimes not even that.
I've heard that, at least in the US, the patent office will not accept perpetual motion machines or free energy devices, taking the prudent stance that such contraptions are impossible. The decision may also have to do with how common the claims are, and how much extra useless paperwork they would produce.
Patent offices are not scientific institutions. They do not conduct in-depth experiments with every designer's ideas. They do not carry out clinical trials for the latest herbal supplements. They exist to provide an innovator with a protection against someone else copying his work, so that he can make money off his idea. Whether or not you like such things as copyright laws, this should be something to know.
If you want to know if something works, you should test it according to the principles of science and logic. If you're willing to trust someone, you should trust results in good scientific journals, conducted by people who take the necessary efforts to remove their biases. It's that methodology that credibility comes from, not a government stamp of approval.