Vita Clay slow cookers are the only brand that I know for sure does not have lead in the glaze of their pots. Their pots have no glaze at all and they work very hard to ensure their products are made from chemical-free natural clay. I called Vita Clay and talked with them about the clay they use. Their pots are made from zisha clay, which is a famous Chinese clay, known for its purity. It has been used for centuries to make teapots because zisha teapots are treasured for their ability to enhance the flavor, aroma and texture of tea. Zisha clay is also structurally strong without glazing and does not crack when subjected to large and sudden temperature differences. Vita Clay pots are certified lead-free by SGS and are also tested by the FDA.