I'm of the same mind as you. There has to be a catch somewhere. I think the problem is that there is a lack of sufficient long term studies.

I do question how "healthy" and "good for you" ANY product is that is so refined that the original ingredient is unrecognizable. Stevia is not found in nature as a fine, white powder. How much of it's usefullness is destroyed in the refining process.

As for herbs, I could get my mom on here. We'll never hear the end of the purported benefits of herbs and spices such as parsley, cumin, anise etc.