Pinit GIANTmicrobes Keychain Serotonin SKU Keychain Serotonin An internal error has occurred $8.99 (0)No Reviews yet Quantity -+ Details Serotonin is a neurotransmitter that plays a role in mood, memory, sleep and cognition. Our Serotonin is based on the shape of the actual molecule! Si... Details Back DetailsSerotonin is a neurotransmitter that plays a role in mood, memory, sleep and cognition. Our Serotonin is based on the shape of the actual molecule! Size: 2-4" with clip. Ratings & ReviewsNo reviews availableBe the first to Write a Review