For decades, doctors believed selective serotonin reuptake inhibitors operated by boosting levels of serotonin, a chemical which carries signals between neurons in the brain. This supposition was based on the hypothesis that a lack of serotonin causes depression. This supposition was based on the hypothesis that a lack of serotonin causes depression. The most mysterious medicine are a group of widely used antidepressants. Do you think that the reason why people are depressed holds any water?

