There is no such thing as when is the best time to take Colla Corii Asini, usually there is no time limit for taking Colla Corii Asini. For people with insufficient qi and blood, you can take Colla Corii Asini all year round. For sub-healthy people who want to use Colla Corii Asini to regulate and nourish, it is recommended to take Colla Corii Asini in fall and winter. Colla Corii Asini is a traditional Chinese medicine, sweet in nature, flat in flavor, and belongs to the lung, liver and kidney meridians. Colla Corii Asini has the effects of tonifying blood to stop bleeding, nourishing yin and moistening the lungs (replenishing the body’s yin fluid to nourish the lungs). For people who have insufficient qi and blood and want to take Colla Corii Asini to replenish qi and blood, it is recommended to take Colla Corii Asini all year round. However, for people who are sub-healthy and just want to take Colla Corii Asini to nourish their body, it is recommended to take Colla Corii Asini in fall and winter. Because Colla Corii Asini is more nourishing and can moisten the dryness, so it is more appropriate to take in the fall and winter seasons. It is recommended to take Colla Corii Asini under the guidance of a professional doctor and go to the hospital if you feel unwell.