Old hen contains estrogen, but within the edible range. Old hen is actually a long time breeding hen, 100 grams of old hen meat mainly contains 19.3g protein, 251mg potassium, 156mg phosphorus and other nutrients, can be supplemented for the body of the components and nutrients needed, its nutritional value is still relatively high. Of course, the old hen belongs to the female animal, its body is also estrogen, so as to maintain their own female characteristics, but its content is within the edible range, after consumption will not cause any effect on the human body. In fact, all animals have estrogen in their bodies, including male animals, but they are all within the edible range and will not affect the human body.