There have been no studies on sour jujube kernel being harmful to the kidneys. From the adverse reactions and contraindications of this product, sour jujube kernel is not harmful to the kidneys when used in the correct dosage and under the guidance of a professional physician. Sour jujube kernel is a traditional Chinese medicine, which is the mature seed of sour jujube from the plant of Ratites jujube. It has the effect of nourishing the heart, benefiting the liver, calming the mind and restraining sweating. It has therapeutic effects on conditions such as palpitations (rapid heartbeat, often accompanied by panic), forgetfulness, insomnia, dizziness, spontaneous sweating (involuntary sweating during the daytime, aggravated by the slightest movement of sweating), and injury to the body fluid. This product is used as internal decoction, or powder, or into pills, bulk. The adverse reactions and contraindications of this product are not clear at present. Caution should be taken when using the product. Caution should be taken in cases of solid evil and fire; caution should be taken in cases of slippery drainage. If you need to use the drug, you should be guided by a traditional Chinese medicine practitioner under the guidance of the identification of the drug, do not buy your own medicine to use, so as to avoid delaying the condition of the drug is not the right evidence.