It's simple: If it doesn't have the "drug information" box, it's not a real drug. That is, it hasn't been approved by the FDA, and there's no evidence (unless you're fond of "anecdotal evidence") that it works. It should have something like this:

http://www.intelihealth.com/i/L/Label.gif

If it's not a real drug, it'll have something like this instead:

http://www.remediesdirect.com/media/headers-disclaimer.jpg