Can I drink Cornus officinalis (Shanzhuyu) if I have nephritis?
Generally speaking, individuals with nephritis can consume Cornus officinalis (Shanzhuyu), but it should be done under the guidance of a physician. The specific analysis is as follows:

As a traditional Chinese medicinal herb, Cornus officinalis has functions of nourishing the liver and kidneys and astringing to relieve symptoms such as excessive discharge or perspiration. Some patients with chronic nephritis, especially those presenting symptoms of kidney deficiency, such as lumbago, weak knees, dizziness, and tinnitus, may benefit from moderate use of Cornus officinalis to alleviate these symptoms. However, this should be done only under the supervision of a TCM practitioner to ensure it does not conflict with the patient's current condition or medications.
However, patients with chronic nephritis usually have a relatively low metabolic function. Although Cornus officinalis can nourish the liver and kidneys, it has a sour and astringent taste with a slightly warm nature. Excessive consumption by patients with chronic nephritis may increase the burden on the kidneys and be detrimental to disease stability. In addition, Cornus officinalis may cause gastrointestinal discomfort, heatiness, and other side effects. Therefore, it is recommended that patients take Cornus officinalis in appropriate amounts under a doctor's guidance and pay attention to monitoring kidney function and other relevant indicators.
In daily life, patients are advised to maintain good living habits, follow a balanced diet, and avoid excessive fatigue, all of which can aid in the recovery from nephritis.