It should be the angelica in it. Rehmannia glutinosa is sweet and sticky, so it has diarrhea because it is not easy to digest. This is a common disease. Semen Cuscutae is the most effective method to treat low back pain, which is simple, safe, cheap and effective, and can tonify kidney and replenish essence, and treat diarrhea due to yang deficiency of spleen and kidney. You can drink it with10g boiling water, try soaking it in water, or get some dodder porridge.