The one I am personally familiar with is prescription drugs as the only real treatment modality for some conditions. They are overused and have serious, harmful side effects (as well as other downsides, like high costs). I have found alternatives that work, but trying to find a way to spread the word has been, call it, challenging. It is a problem space I am very familiar with and only just now figuring out how to proceed. So I don't know that it helps you any to mention it.
I have a private invitation-only health blog. I also started a food blog back in June. I also carefully participate in discussions on a couple of public forums, hn being one of them. I currently have no monetization plan in place for that stuff. Trying to cone up with a business model for it has also been challenging.
If you want to discuss it more in depth than that, you can email me.
Best of luck.