Xuehai (血海) is located on the inner thigh, about two thumb widths above the knee, in the area of the vastus medialis muscle. This acupoint is known as the “Sea of Blood” because it plays a vital role in regulating blood circulation. In TCM, Xuehai is often used to help with irregular periods and infertility by promoting blood flow, nourishing the reproductive organs, and balancing Qi. It is commonly used to address issues like blood deficiency or stagnation, which can interfere with a healthy menstrual cycle and fertility.