Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Oriental arborvitae (Platycladus orientalis, formerly Thuja orientalis) has a longstanding history of use in traditional Chinese medicine (TCM) for various respiratory ailments, including sinus congestion. In TCM, the seeds (also called Biota or Bai Zi Ren) and sometimes the leafy parts are believed to "dispel phlegm" and "clear heat," which are concepts roughly equivalent to reducing mucus and inflammation in the airways. Decoctions and herbal formulas containing arborvitae have historically been used to treat symptoms like nasal congestion, cough, and phlegm associated with colds or sinus issues. However, scientific studies directly validating its efficacy for sinus congestion are scarce. Most available research focuses on other properties, such as its effects on insomnia, anxiety, or as an antimicrobial agent. There is some laboratory evidence for anti-inflammatory and antimicrobial effects, which could theoretically be beneficial in respiratory tract infections, but clinical evidence is lacking. Therefore, its use for congestion is primarily rooted in traditional practice, with only indirect or theoretical support from modern science. People considering its use should be aware that high doses of arborvitae can be toxic and may cause side effects. In summary, oriental arborvitae is traditionally used for sinus congestion, but high-quality clinical evidence is lacking.

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