Why are natural substances not approved by the FDA

Why are all these natural products that claim to be the best thing for you not approved by the FDA? Obviously none of these are bad for you, so why wont the FDA study their effects and approve them, so they can stop putting that little disclaimer "Not approved by FDA, not intended to cure, etc." right under the message that says "Cures Such and such!"

Cos the FDA are trying to protect us. They have guidelines that they go by. First up they will want to know toxicity level? As it's a food not a drug it will obviously fail the first test cos food doesn't poison you (not supposed to at least). That's the second point as well, next they'll want to know what it will cure, well in general it will make everything in the body work, duh??? Nope they'll say, nothing that it cures then it can't be classified by FDA, have to sell it in the health food stores or perhaps multi level marketing...........

****** Noooooooooooooooo, you don't get it !!!!

The FDA works under the parameters of three specific questions that they ask, no inbetweens or halfways or maybe's. The answers to these questions need to be correct or they don't approve it !!! Now, I'm not saying this is right wrong or otherwise I'm just trying to explain the answer to your question.

First question they ask - What is the toxicity level of your product? In other words, how much of it would kill a person? They say this cos they don't want to kill people they want to have safe levels of drug administration out there, they reckon they are being responsible !! They won't classify a food as a product that heals ailments basically cos historically foods, carbohydrates, sugars etc. are suppose to provide energy, herein lies the anomaly !! They refuse to get with it and think outside the square, very black and white tunnel vision so to speak.