Astragalus membranaceus and Codonopsis pilosula belong to Chinese herbal medicines. Choosing a teapot when stewing these Chinese herbal medicines can make the efficacy volatilize more fully. The teapot is rich in minerals and has good air permeability, which is conducive to the full reaction of drugs. The price of ceramics is relatively low. Although it can also stew medicinal materials, the effect is not as good as purple sand.

Both Radix Astragali and Radix Codonopsis have the effects of invigorating qi and nourishing stomach, and can be used to treat weakness, yellow complexion and other symptoms.