Love is complicated, scientifically speaking. There’s no single, specific “love chemical” that surges through our bodies when we see our beloved, and we can’t point to a specific corner of the brain where love resides.
Still, scientists have measured real changes in our bodies when we fall in love: an ebb and flow of signaling molecules. In that early lustful phase, sex hormones like testosterone fuel the libido (in both men and women). The dopamine highs of new attraction have been compared by some scientists to the effects of cocaine use.
The anxiety associated with new romance has been linked to low levels of serotonin in the brain. And some researchers say they see similarities in the way serotonin is regulated in the early phases of love and the way it is