Synopsis

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

Oriental arborvitae (Platycladus orientalis, also known as Thuja orientalis) has a long history of use in traditional Chinese medicine (TCM) for the treatment of respiratory conditions, including coughs and colds. Historical texts and TCM practitioners have used the seeds (often called "biota seeds" or "baiziren") and sometimes the leaves as part of herbal formulations believed to "clear heat," "resolve phlegm," and support lung health. The rationale for its use is largely based on empirical observations and holistic theories typical of TCM, rather than on modern scientific mechanisms such as direct antiviral activity.

There is limited laboratory evidence indicating that extracts from Platycladus orientalis may possess some antimicrobial or immune-modulating effects, but robust clinical studies validating its efficacy against viral infections such as the common cold are lacking. Most available research is preliminary or in vitro, and does not directly substantiate the traditional claims. Thus, its use for colds is primarily justified by traditional practice, with only weak scientific evidence supporting its effectiveness in this context. The evidence rating of 2 reflects that while traditional use is well documented, scientific validation remains limited and inconclusive.

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