Our inboxes have been filled to the brim with advice from people peddling vitamins, herbs, and diets—all claiming that the product that they were hawking would help supercharge the body’s defenses to ward off the coronavirus. Is there any truth to these pitches? Can certain foods—like elderberries, garlic, and zinc—really help strengthen your immune system? How about a good night’s sleep, or getting enough exercise? We take a hard look at these claims, with help from Timothy Caulfield, a law professor at the University of Alberta and the research director of its Health Law Institute. He studies how companies and brands use and misuse medical and scientific research, and he’s the host of the TV series A User's Guide to Cheating Death, in which he debunks pseudoscientific claims.