Ejiao is a type of medicine made from the skin or bones of horses.
You know how you might have a scab on your knee after you fall down and hurt yourself? Well, horses can get scabs too, and sometimes those scabs turn into bigger bumps called "horses' tears." When that happens, some people take the skin off the horse and cook it to make ejiao.
Ejiao is really important in traditional Chinese medicine. It's believed to help with things like coughs, colds, and even making your skin look better. Some people also think ejiao is good for your blood and can help with things like anemia (when your body doesn't have enough healthy blood cells).
Nowadays, ejiao is sold in lots of different forms, like pills or even candy! But it's important to remember that not everyone agrees on whether ejiao is really helpful for these things, and that there are concerns about the welfare of horses being used for the medicine. So before you take ejiao, it's good to talk with your doctor and make sure it's safe for you and the horses too.