Not a lawyer -- but you're allowed to write whatever you want online. For example, people can write about banned supplements, pills, etc and stir up controversy about the FDA preventing sick people from getting the homeopathic medicine that will "cure" them... and be totally safe. But it's another thing entirely to sell the homeopathic pills and advertise them as a cure for XYZ.
Another example, if you live in Las Vegas and I instruct you to "drive to Los Angeles in one hour" and that means you would have to break the speed limit to do so, then I'm still not liable for your actions even though you followed my advice.
That said, you should have disclaimers all over your site.