Serotonin Molecule Necklace 925 Sterling Silver or 18k Gold Over Plated Necklace Fine Jewelry Unique Jewelry Molecule Necklace - Fine 925 Sterling Silver Jewelry Molecule structure of Serotonin Sold with warranty 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!