Prince of Peace's 100% Organic Pu-Erh Tea is a post-fermented tea produced in Yunnan province, China. Pu-Erh is a Chinese specialty that is also called dark tea. Prince of Peace Pu-Erh Tea is selected from high-quality tea leaves from Yunnan. Prince of Peace Pu-Erh Tea has an earthy flavor, a soothing aroma, and antioxidant properties. An average cup of Pu-Erh tea contains about 5-15 mg of caffeine, while a cup of coffee ranges from 100-180mg.