I'd agree that regulating food supplements, herbs, and juices as drugs is a little over the top, but according to the FDA's regulations, if you make health-related or medicinal claims about a product, that's the chance you take. If, for instance, you're going to claim that colloidal silver cures over 600 diseases (it doesn't, by the way, there's no good evidence it cures anything) you're claiming in effect that it's a drug as the FDA interprets these things. The same is generally true in Canada: claim therapeutic benefits for your product, you'd better be prepared to prove it.
Regulation in itself isn't such a bad idea though. These are processed products intended for human consumption; wouldn't you like some assurance that what you're getting is what it claims to be, in the amounts indicated on the label, and that it actually works? Without regulation there's no quality control. Stephen Barrett's
Quackwatch site reports many instances of herbal products being tested and found to contain much less or much more of the product than the label claims, they're often contaminated with micro-organisms and heavy metals, some of them are known to have adverse drug interactions, and many of them haven't ever been properly tested for their supposed therapeutic effects. There's a lot of quackery out there in the supplements and herbs business, so be careful.
A little common sense is indicated too, though it seems to be lamentably uncommon sometimes. You can turn orange and poison yourself with carrot juice if you drink enough of it. Just because some of something is a good thing doesn't mean huge quantities of it are better.