Pu-erh has an uncommon and distinctly earthy taste. It is the only fermented tea, and can be created from both green and black teas. These teas are aged, and like fine wine, become more complex and smoother tasting over time. Pu-erh teas are sold as loose leaf teas or as compressed bricks of different shapes and sizes. The fermentation process is reputed to provide a variety of health benefits including improved blood circulation, hang-over relief, and perhaps even the prevention of heart disease and cancer. Pu-erhs are often enjoyed after a heavy meal as a digestive and can be steeped many times, unveiling multiple layers of taste.