Red light therapy (photobiomodulation) is exploding in popularity — but why is the medical establishment pushing back? Investigative journalist and author Jonathan Otto joins to break down what red light and near-infrared therapy actually does, whether the science supports the biggest health claims, how long results take, side effects, whether it works for hair loss, and if you can overdo it. If Big Pharma is scared of it, that's reason enough to pay attention.