The skin of walnuts is also called the inner bark of walnuts, which has the following effects: First, to stop bleeding, because the inner bark of walnuts has a certain astringent effect, for bleeding has a hemostatic effect, the inner bark of walnuts in a pot after frying yellow, grinded into powder, sprinkled in the wound can immediately stop bleeding. Second, the treatment of insomnia, because the inner bark of walnuts acts directly on the nerve substances of the human body, can regulate the nerves, relaxation, insomnia has a very good therapeutic effect on humans. It can also be added to water and brewed as a tea substitute, taking a cup one hour before bedtime, which can reduce or eliminate the symptoms of insomnia patients. Third, treatment of impotence, in the cause of impotent men is mostly due to the lack of kidney qi or kidney deficiency, walnut inner bark has good therapeutic efficacy for these symptoms. Because it has the effect of tonifying kidney qi and warming kidney yang, it is good for adjusting impotence caused by kidney weakness, as well as alleviating seminal emission and slippage, and for relieving lumbago in middle and old age.