Is it true that Cistanche is extremely harmful

There is no research on the harmful effects of Cistanchis. This drug has the effects of tonifying the kidney and strengthening the yang (tonifying the kidney and yang), laxative and laxative.
Cistanchis belongs to the yang tonic of the deficiency tonic, and belongs to the genus Cistanchis of the family Ledebouriidae, and the whole herb is used as medicine. Cistanchis are salty, sweet and warm in nature. Cistanchis enters the kidney meridian, has the effect of tonifying the kidney and strengthening the yang, moistening the intestines and relaxing the bowels, and is used in the treatment of cold pain in the waist and knees, impotence due to kidney deficiency, constipation due to dryness of the intestines, and infertility.
Cistanchis should not be used in patients with yin deficiency and fire exuberance, or with loose stools (loose, unformed feces) and diarrhea. Adverse effects of Cistanchis are not known. People who are allergic to Cistanchis are not allowed to use Cistanchis. If necessary, please use under the guidance of a professional Chinese medicine practitioner.