Pu Er tea has been celebrated since the Tang Dynasty ( 618AD-906AD ) for its health benefits and curative powers in certain diseases. Modern medical science has recently shown that the health benefits of Pu er tea may be more than just Chinese folklore. Pu-erh tea contains caffeine, although not as much caffeine as other teas. Caffeine works by stimulating the central nervous system (CNS), heart, and muscles. Pu-erh tea also contains antioxidants and other substances that might help protect the heart and blood vessels.