""Studies have shown measurable effects on multiple body and brain systems, said Doraiswamy. Those include mood neurotransmitters (serotonin, norepinephrine), reproductive hormones (testosterone), social bonding hormones (oxytocin), cognitive and pleasure related neurotransmitters (dopamine), inflammatory and immune systems (cytokines), stress hormones (cortisol), cardiac and EEG rhythms, blood pressure, and blood sugar."" - April Buchheit