I would absolutely agree that, as with most things there is a lot of 'snake oil' out there. As well as charlatans.
The clinicians I have dealt with though, are medically trained doctors and endocrinologists who treat the patient as an individual. They take into account their full medical history as well as current symptoms.
I have only positive things to say about them based on my personal experience.
Stress levels need to be kept to a minimum though.
I'm no fool, believe me. Having worked in marketing for years before retraining, I know what spin is.
My situation is slightly more complex as I have an auto immune illness. All I can say is my overall health has improved hugely. Something my GP wasn't able to help with.
You stick with what works for you.