If serotonin is a hormone of "happiness" then how come is it low when we're in love? do all infatuated people have low levels of serotonin?

Love & serotonin: I think this shows that the experience of "love" is much more complex than serotonin levels -- and also that infatuation is not completely blissful. Consider the constant checking for messages from a new flame, and the agony if the desired lover doesn't return one's feelings or interest. There's both an obsessive quality to it, and there is suffering. Similar neurotransmitter issues in ocd.

Learn About Oxytocin: Oxytocin "is far more than a useful bedroom, birth and breast-feeding aid – it is also a neurotransmitter that acts on the limbic system, the brain’s emotional centre, promoting feelings of contentment, reducing anxiety and stress, and even making mammals monogamous." read more: http://www.Dailymail.Co.Uk/home/you/article-2202045/happy-hormone-why-really-good-hug.Html#ixzz2wqxzwxpz follow u.