The Chinese tea history of Pu'er tea is fascinating. Pu'er tea is one of the oldest type of tea in China with a rich history of over 1700 years. Pu-erh tea can be drunk immediately or aged for many years; pu-erh teas are often now classified by year and region of production much like wine vintages. The Pu Erh tea leaf gets better and results in a rich flavor during the aging process. Pu-erh tea caffeine level is lower than coffee, can increase metabolism , that makes it a good choice for those who find themselves jittery after just one cup of coffee.