A Cure for Cancer

This article doesn't unearth any revelations about the way the pharmaceutical industry works, but it left me wondering: why is FDA approval even necessary in this case? I am dangerously ignorant here, but it seems to me that virtually anyone can slap a label on a bottle of pills and sell them as "herbal supplements" or "homeopathic remedies" at the local health food store. Add the requisite warning that "these claims have not been verified by the FDA" and then say the pills have been shown in some studies to prolong the lives of cancer patients.
Like Jonas Salk, Michelakis hasn't patented his discovery. It's not because he doesn't want to, but because he can't. When it comes to patents, DCA really is like the sun: It's a cheap, widely used chemical that no one can own.
As cancer patients exhaust their conventional and clinical options in search of a cure and their life expectancy shortens, I suspect they become increasingly willing to try anything that might help. Are there real barriers to bottling this as an herbal remedy? Apparently not. If the treatment is effective, then, I'd expect its popularity to rise even without the FDA's blessing.  If the treatment has been around for awhile (as I'm led to believe it has), and isn't yet wildly popular, then perhaps it's not as effective as some make it out to be.