It is the Nutritive Qi responsible for feeding the internal organs and the body in general.
It is also called Ying Qi or Yong Qi.
Compared to Wei Qi, it is the Yin polarity of Zhen Qi
It is intimately related to Blood since it flows with it both through the blood vessels and the channels.
It originates from the pure part of food plus the pure part of the air (Zong Qi) and the Body Fluids.
It has two energy circulation circuits in the body: