Hellow guys, Welcome to my website, and you are watching Dopamine, Serotonin, Oxytocin, Endorphin (#2 of 7) - Happy Brain Chemicals. and this vIdeo is uploaded by Inner Mammal Institute at 2017-02-10T15:17:26-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.