While it sounds great to say that taking this medication is “fixing chemical imbalances in the brain,” the problem is that no one gets to do experiments on a live human brain. Thankfully. And dead human brains don’t send chemical messages and can’t be depressed. Neither really can animals, at least those generally accepted for grisly lab experiments. So no one actually knows whether depressed people have less serotonin in their brains.
Read more at How happy is your brain?