Conventional wisdom holds that there’s not much you can do to prevent colds and flus—and even less you can do to treat them. [Y]ou could get a flu shot, but research suggests they aren’t nearly as effective as many believe. OTC remedies like antihistamines . . . do nothing to prevent them or shorten their duration. And . . . antibiotics . . . aren’t useful for treating the viral infections that cause colds and flus.
But here’s the good news . . .