Can Prunella vulgaris be steeped in water for long-term consumption?
Generally speaking, Prunella vulgaris (Summer枯草) should not be consumed long-term by steeping in water. The specific analysis is as follows:

Prunella vulgaris has a bitter and cold nature. Long-term consumption may damage the yang energy of the spleen and stomach, leading to spleen and stomach deficiency-cold, and causing digestive system discomfort symptoms such as abdominal pain, diarrhea, and loss of appetite. This is especially true for individuals who already have weak spleen and stomach function; long-term consumption is not advisable. Prunella vulgaris contains certain components, and long-term, excessive intake may cause other adverse effects on the body. Although current research on its exact adverse reactions is not yet fully clear, from the perspective of traditional Chinese medicine safety, long-term continuous use is not recommended.
Long-term use of cold-natured herbs like Prunella vulgaris may have certain effects on liver and kidney function, particularly for those who use it long-term or have incompatible body constitutions; these effects may be more pronounced. Some individuals may be allergic to components of Prunella vulgaris, and long-term consumption may increase the risk of allergic reactions. The use of any medication should be determined according to individual circumstances.
Consuming Prunella vulgaris water long-term solely for health purposes without corresponding medical conditions is inappropriate. If there are medical conditions requiring the use of Prunella vulgaris, it should be appropriately administered under a doctor's guidance, including proper dosage, treatment duration, and monitoring for adverse reactions. During use, if any discomfort occurs, usage should be stopped immediately and medical attention sought.