Big Leaf Kuding (Bitter)
Big Leaf Kuding, also called "Bitter Nail Tea", is actually not a tea. It comes from an entirely different plant, and is commonly used in traditional Chinese Medicine.
It is said to help regulate blood pressure and promote good circulation, among other benefits. Be warned, it is called "Bitter Nail Tea" for a reason, as a very bitter taste is achieved after just a few seconds of steeping.