Peppermint flavored Certs - Though classified as mints, Certs actually contain no oils of any mint plant. Instead, they have been long time advertised as containing "Retsyn," a trademarked name for a mixture of copper gluconate, hydrogenated cottonseed oil, and flavoring. It is the copper gluconate in Retsyn which gives Certs its signature green flecks, also referred to as Restyn Crystals. Certs Classic Peppermint Mints give the right amount of mint in each roll. 24 - .72oz. Certs Peppermint Mint Rolls Net wt. 17.28oz.