Unfortunately there are a lot people out there wanting to take advantage of those who are desparate for answers, and relief. People selling "snake oil" cures have been around for hundreds of years. So this is nothing new, just the addition of the internet provides a new way to prey on people.
That's not saying all natural treatments are snake oil. But you really need to do your research, AND talk to your doctor first.
A lot of things haven't really been proven either way IMO either. Look at the fish oil. I just read a study the other day, now they are saying it didn't help people with Crohn's. So it's just important to keep your doctor in the loop, and do your reading! Because not only could you lose your money, but it can be down right dangerous for your health too!
Here is a cheap solution from the UC board. I cringe at the nuts but I do love spinach and rarely eat it at home. Think I might start.
I think it's unfortunate that so many people on here are demonizing profit motive. That's a powerful force that may eventually bring about a cure for these diseases (despite the fact that now it seems like the profit motive is pushing pharma companies to make drugs you take every day instead of a one-and-done cure). And there's a lot more to medical research than you may think. There are a lot of political forces behind what gets published and even the structure of studies is now being seriously questioned (i.e. randomized controlled trials will no longer be the ideal study to run).
The bottom line is that big results require big changes. An herb or supplement will unlikely bring about a significant change, though it may help somewhat. Changing your diet around drastically and continuing it for several years may be the answer for some. It's a fact that there are people who no longer experience symptoms of this disease and they all figured their own way out, but the vast majority of such people were on a diet of some sort.