Walnut core wood has a certain effect of tonifying the kidney and astringent, contraindications and adverse reactions are not clear. Walnut core wood, i.e., the heartwood, is the woody septum in the kernel of the walnut fruit of the walnut plant of the walnut family. It is bitter, astringent and neutral in nature, and belongs to the spleen and kidney meridians, with the effect of tonifying the kidney and astringent essence. This product astringes essence and stops slippage, used for spermatorrhea and slippage, dizziness, lumbago and leg weakness, panic and shortness of breath, mental depression, tiredness and fatigue. This product can stop leucorrhea, used for leucorrhea, leucorrhea increase, continuous, lumbago. This product can stop diarrhea, used for diarrhea, diarrhea urgently, abdominal pain with intestinal ringing, plumpness (stomach distension and discomfort), distention and stuffiness in the abdomen (abdomen feels distended and uncomfortable), and less food. Contraindications and adverse reactions are not clear, if you need to use the drug, it is recommended to use under the guidance of a professional physician to identify the evidence, not blindly self-medication.