Colla Corii Asini is too nourishing and greasy, so it is not suitable for those who have phlegm-dampness, dampness-heat and blood stasis in the body, in addition, it is generally not suitable for women with weak spleen and stomach and menstruation. 1. Colla Corii Asini is sweet in taste and flat in nature, with the effects of tonifying blood, stopping bleeding, nourishing yin and moistening dryness (nourishing yin essence and removing heat), etc. Colla Corii Asini belongs to the nourishing, greasy and thick-flavored products, so if there are tangible evils in the body, such as phlegm-dampness, stasis of blood, dampness-heat, etc., which are combined with the nourishing, greasy and thick-flavored product of Colla Corii Asini, it would make tangible evils in the body more solid and not easy to be eliminated, but will exacerbate the condition. 2. People with weak spleen and stomach, as the spleen and stomach are not able to properly transport and putrefy (initially digest food and form food waste) food, coupled with the nourishing and greasy nature of Colla Corii Asini, it is easy to produce phlegm and dampness itself, which stays in the stomach, causing indigestion and increasing the burden on the spleen and stomach. 3. Women who are menstruating should also pay attention to the use of Colla Corii Asini. Colla Corii Asini has the effect of tonifying blood and stopping bleeding, so it is best not to consume it during menstruation to avoid causing menstrual disorders. For specific dietary advice, consult a medical professional.