Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Oriental arborvitae (Platycladus orientalis, also known as Thuja orientalis) is primarily used in traditional Chinese medicine. Its seeds, known as Bai Zi Ren, have been employed for a variety of ailments, mostly related to calming the spirit, insomnia, and constipation rather than cold sores. However, in some traditional herbal formulas, it has been included for its purported antiviral and immune-supportive properties. There is scant historical documentation directly linking oriental arborvitae with the treatment of cold sores (herpes simplex virus), but some traditional texts suggest its general use in conditions involving "heat toxins," which could be interpreted broadly as viral infections.

From a scientific perspective, there is limited laboratory evidence that extracts from Platycladus orientalis possess antiviral activity against certain viruses. However, specific studies evaluating its efficacy against herpes simplex virus—the causative agent of cold sores—are lacking. No clinical trials or robust scientific reviews support its use for cold sores in humans. Therefore, while its use is based on traditional beliefs and practices, the evidence supporting its effectiveness for cold sores is weak and should be considered anecdotal rather than evidence-based.

Overall, oriental arborvitae’s use for cold sores is primarily justified by traditional practices, with little to no direct scientific validation.

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