The Hormone Tracker tracks hormones, which are the long-terms nervous systems in our body. Hormones also drastically affect mood by physiologically changing the degree of our response to our emotion. Testosterone, for example, often amplifies aggression, social dominance and anti-social behaviors. Another example is dopamine, which if often the target of anti-depressant drugs, affects our happiness level. Like most biological functions, Hormones acts in an antagonistic fashion where there is often two hormones acting against each other to create a degree of reactions.