Matric-and if it's all natural ingredients, could not anybody produce it and market it? You cannot have an exclusive license a product that is simply a compilation of generic ingredients.
Blends of generic ingredients cannot be patented. If you find a particular herb improves some condition which was never known before, you could apply to patent that idea. Coca Cola's formula, KFC's recipe, and the like fall under trade secrets.
It's not hard to figure out all the ingredients and their percentages in something. When I took P-Chem in college, every week we were handed some concoction and had to do exactly that. There were only two grades for lab, A and F. If you weren't within .001% of the actual answer, you received an F. Get more than two F's in lab, and you fail the entire course. Once determining the composition, I think you could easily go around someone's trade secret by making some strategic changes.