Can Rehmannia glutinosa be taken for a prolonged period?

Generally speaking, Rehmannia glutinosa (Sh熟地黄) is not recommended for long-term consumption. The specific analysis is as follows:

Rehmannia glutinosa has a greasy nature and is difficult to digest. Long-term and excessive consumption may affect the digestive functions of the spleen and stomach, leading to discomforts such as indigestion, abdominal distension, loss of appetite, and sticky stools, especially in individuals with pre-existing weakness of the spleen and stomach. Although rare, some individuals may develop allergic reactions such as rashes and itching after prolonged use.

Rehmannia glutinosa has a certain blood pressure-lowering effect. Long-term consumption may further reduce blood pressure, causing symptoms related to hypotension such as dizziness and fatigue, particularly detrimental to individuals with already low blood pressure. Long-term use of a single herb may decrease the body's sensitivity to it, thus affecting its therapeutic efficacy. Prolonged and excessive consumption of Rehmannia glutinosa may also have adverse effects on liver and kidney functions, such as increasing the liver's workload and affecting glomerular filtration function.

When using Rehmannia glutinosa, it should be appropriately administered under a physician's guidance based on individual conditions, including dosage and duration of treatment. During consumption, it is important to monitor physical responses and adjust medication promptly if any discomfort occurs. To prevent side effects, do not take Rehmannia glutinosa for prolonged periods without medical supervision.