Walnut medicinal parts are mainly walnut kernel, walnut skin has no obvious medicinal value, walnut kernel can not treat insomnia alone. Walnut kernel has the effect of tonifying the lungs and kidneys, nourishing the qi and fixing the wheezing, and moistening the intestines and laxatives. Clinically, it is mainly used for the treatment of lumbar and knee pain, spermatorrhea and enuresis, cold cough, intestinal dryness and constipation. Walnut kernel is not recommended for people with phlegm-fire and heat accumulation, yin deficiency (deficiency of yin and essence in the body, hyperactive fire), and loose stools. Adverse effects of walnut kernel are not clear, during the period of taking the diet should be light, avoid smoking, alcohol and spicy, cold, greasy food. If the patient has any discomfort, please go to the regular medical institutions; if you need to use walnut kernel, must be used under the guidance of a professional doctor.