The brain chemicals behind your mood, sleep, and body functions Medically reviewed by Shaheen Lakhan, MD, PhD, FAAN Ever wonder what's going on in your brain when a certain mood strikes? You can thank ...

Meet the brain molecule of the moment: 4-(2-Aminoethyl)benzene-1,2-diol. You have been its beneficiary from birth. Lately, you might have seen it splashed across the headlines under its common name.