There are no studies on the toxicity of sand nuts. It has the effects of resolving dampness and opening the stomach (normalizing gastrointestinal function by removing dampness), warming the spleen and stopping diarrhea (relieving diarrhea by warming the spleen), and regulating qi and tranquilizing the fetus. Sand nut belongs to the dampness-eliminating medicine, the family of which is the mature seasonal fruit or seed of the ginger plant Yangchun sand nut, green-shelled sand nut, or Hainan sand nut. With pungent flavor and warm nature, it enters the spleen, stomach and kidney meridians, and is used in the treatment of vomiting and diarrhea due to spleen and stomach deficiency (spleen and stomach weakness and coldness), pregnancy obstruction (in early pregnancy, there is heavy nausea and vomiting, dizziness and anorexia, or even vomiting when eating), dampness obstruction and qi stagnation (due to the obstruction of dampness that leads to the human body’s poor qi), inappetance, distension of epigastric region, and restlessness of fetus, etc. The adverse effects of Ren are not clear. Adverse effects of Sarcophagus are not clear. Caution should be exercised if there is yin deficiency and blood dryness (deficiency of yin fluid and dryness and heat in the blood). If necessary, please use under the guidance of a professional Chinese medicine practitioner.