"A Jiao" is a revered traditional Chinese herbal remedy made from donkey hide. It's known as the "Holy Medicine for Blood Tonic" and ranks among China's top three tonics alongside ginseng and deer antler. A Jiao nourishes Yin, stops bleeding, replenishes blood, regulates menstruation, and supports pregnancy. Modern research confirms its immune-boosting properties. Rich in proteins and amino acids, it balances metabolism and promotes blood production. A Jiao's remarkable history includes its association with Empress Dowager Cixi, who used it to overcome a "blood disorder" and successfully give birth.