Have all of your friends ever been obsessed with a TV show you've never seen? When you hang out, they laugh about the most recent episode, quote their favorite characters, and compare theories about the season finale—and you just sit there. That's how I felt whenever my friends talked about Wellness Formula , a supplement made by a company called Source Naturals. It claims to "support the immune system when under physical stress" through a "powerful combination of herbs, antioxidants, vitamins and minerals formulated to boost your well-being." My friends (and I'm hoping I can still call them that after this article!), swear by it—and to me, it sounds like bullshit. Nonetheless, about a week ago, I woke up on a Sunday morning with a sore throat, and my friends had that look in their eyes—the Wellness Formula look. "That stuff is just a placebo," I told them. They disagreed. "It's not approved by the FDA," I said. They were unfa...