I think that Serotonin is still a mystery in the medical community. The problem is that you can't look inside someone's brain while they're alive and see everything that's going on in their bloodstream. 🙂 . I've been on every medication you can think of for Obssessive-Compulsive Disorder, Depression, and Anxiety, and it can literally take a lifetime to find the exact combination of the right medications in the right dosages to really feel perfect. And then, as you age, you can develop new psychiatric conditions that young people rarely have.