Synopsis

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

Phenolic acids, a class of plant-based compounds found in foods such as coffee, fruits, whole grains, and certain medicinal herbs, have a long history of use in traditional medicine for respiratory issues, including lung congestion. Historically, plants rich in phenolic acids—such as thyme (rich in rosmarinic acid) and elderberry (rich in various phenolics)—have been used in teas, syrups, or tinctures to alleviate symptoms of congestion, cough, and other respiratory complaints. The rationale in traditional systems is often based on the observed expectorant, anti-inflammatory, or antimicrobial properties of these botanicals.

Modern scientific studies support that phenolic acids possess antioxidant and mild anti-inflammatory effects, which could theoretically benefit lung health. However, direct clinical evidence specifically linking isolated phenolic acids to improved outcomes in lung congestion is sparse. Most findings come from in vitro or animal studies showing that phenolic acids can modulate inflammatory pathways or inhibit microbial growth, which might help reduce the symptoms or causes of congestion. Nonetheless, the translation of these effects to clear clinical benefits in humans remains limited. Thus, while their use is primarily justified by tradition, there is emerging but not robust scientific support, resulting in a moderate evidence rating of 2 out of 5.

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