Let me explain… It’s considered unethical to test Tylenol on pregnant women in a controlled trial… but it’s totally fine to tell millions of pregnant women to use it anyway and just observe what happens. Let that sink in. Randomized controlled trials on pregnant women are almost never approved — researchers say it’s unethical because the fetus can’t consent and harm could occur. But once a drug is on the shelves, pregnant women take it every day for pain, fever, and headaches. Instead of control