Colla Corii As is a nourishing, blood tonic and yin nourishing medicine, it also has the effect of tonifying kidney yin, so it is suitable for patients with yin deficiency, blood deficiency and menstrual dripping. However, Colla Corii Asini should not be used simply because it is very sticky in nature and if it is used alone without the proper combination it may block the Qi flow. In particular, it is important to note that some patients have symptoms of incomplete menstruation, but at the same time have a pathological mechanism of Qi stagnation and blood stasis. This is especially important when taking Colla Corii Asini, which must be combined with blood and qi regulating drugs, otherwise it will aggravate the qi blockage in the body, causing a series of meridian blockage and qi-blood stagnation and corresponding diseases.