Turtle shell and turtle plastron both have the function of nourishing yin and subduing yang. They are often used together in clinical practice, so they are called "Er Jia" (two shells). However, due to their different origins, there are slight differences in clinical use.
Turtle shell, also known as turtle carapace, refers to the plastron and carapace of turtles in the Testudinidae family. It has a sweet, salty, and cold nature. It enters the liver, kidney, and heart meridians. It has the functions of nourishing yin, subduing yang, nourishing the kidneys, and strengthening the bones. It is suitable for dizziness, bone steaming and tidal heat, night sweats, and nocturnal emissions, as well as fatigue and asthenia.
