Art Attack Silvertone Dopamine Molecule Love Passion DNA Chemistry Science Pendant Necklace 18" Cable Chain Pendant is .75" tall x 1.5" wide Since it was discovered, dopamine created a whole new area of scientific study and its study created new medicine used to treat conditions in a variety of physical and psychological problems. The introduction of the neurotransmitter in our physical and mental understanding changed the understanding of both scientists and the people. Dopamine and the neurotransmitter serotonin (responsible for mood, appetite, sleep, memory, learning, and happiness) reduces the other's amount in the brain: If there is more serotonin, the amount of dopamine reduces and vice versa. Eating chocolate releases dopamine and serotonin. You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!