There are many reasons why this is not true. One of them is profits, another one (at least where I live) is the mass oriented, streamlined healthcare, in which there are not enough resources to treat you as an individual, but rather as a number, a small part of an average.
For these reasons, as an example among others, when a woman goes to the doctor because her period is painful, they'll prescribe her birth control pills rather than raspberry leaf tea.
Telling that person apart from the sea of charlatans complicates things a bit. They're not the people who launch their careers with Oprah's help and spawn a million others riding in their wake.
> Telling that person apart from the sea of charlatans complicates things a bit.
Peer review (for all its faults) and clinical trials that inform evidence based medicine. That’s how you tell them apart.