Donkey kidney is the genitals of male donkeys. When killing the donkey, cut the penis and testicles, remove the remnants of meat and grease, soak in cool water, straighten, hang in a ventilated place to dry; or into the pot to cook, cut into thin slices, dry, with fine sand fried hot to yellow out, and then wash the sand, dry that is to become. The Compendium of Materia Medica recorded: "strong yin and strong tendons", indicating that it has a beneficial effect on the kidney, strong yang, strong tendons and bones. Donkey kidney taste sweet, salty, warm, can be the main treatment of impotence, muscle weakness, bone tuberculosis, osteomyelitis, qi and blood deficiency, adulterous female breast milk deficiency, etc., the dosage is more than 9 a 15 grams. If the treatment of kidney impotence, can be used alone donkey kidney 1, boiled, eaten in 2 times, can also be used with dog whip, deer whip to make pills, or with 15 grams of Cortex Eucommiae, 10 grams of Morinda Citri Reticulatae, raw Astragali 30 grams, Cuscuta 12 grams, Epimedium 12 grams of decoction soup, drink the juice to eat donkey kidneys. For insufficient milk, the town with raw astragalus 31 grams, nonpareil 15 grams, add 3000 milliliters of water, decoction to 2000 milliliters, remove the dregs of the medicine, use this soup to cook the donkey kidney, eat donkey kidney, drink the soup. For the symptoms of soreness and weakness of muscles and bones, the donkey kidney can be used with Chinese wolfberry, Morinda citrifolia, Astragalus, Atractylodes macrocephala, pickled ginseng, hyssop, Cistanches, to make pills to be taken.