Nutrient qi, also known as rong qi, flowing in the vessels with the function of nourishing, is extracted from the essence of food and drinks transformed and transported by the spleen and the stomach. It circulates in channels with blood and flows in the entire body via twelve regular meridians, conception vessel, and governor vessel. It is primarily involved in producing blood and nourishing human body. Nutrient qi, abundant in nutritive components, can produce blood when combined with body fluids; hence it is the primary substance for blood engenderment. It circulates in the body with blood and distributes nutrients to zang-fu organs and meridians, maintaining the normal physiological function.