Synopsis

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

Cowherb (Vaccaria segetalis) has a history of use in traditional Chinese medicine (TCM), where it is known as Wang Bu Liu Xing. Traditionally, cowherb seeds have been used to promote circulation, reduce swelling, and address various conditions, including those involving the respiratory tract. In the context of allergies—particularly respiratory allergies—its use is primarily based on traditional formulations that aim to address symptoms like nasal congestion and inflammation, which can accompany allergic reactions.

There is limited scientific research directly investigating the efficacy of cowherb for respiratory allergies. Most of the available evidence comes from its inclusion in multi-herb TCM formulations, rather than studies of cowherb as a single agent. Some in vitro and animal studies suggest that extracts from Vaccaria segetalis may have anti-inflammatory effects, but these findings have not been specifically linked to allergy relief or validated in human clinical trials targeting allergic respiratory conditions.

Overall, the use of cowherb for respiratory allergies is justified primarily by traditional practice rather than robust scientific validation. The evidence rating reflects the paucity of high-quality clinical studies confirming its effectiveness for this specific use.

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