Hyssop (Hyssopus officinalis) has a longstanding history in traditional herbal medicine, particularly in Europe and the Middle East. It has been used for centuries as a remedy to support the bronchial and respiratory systems. In folk medicine, hyssop was commonly brewed as a tea or used in infusions to help alleviate symptoms associated with coughs, bronchitis, and congestion. The plant contains a variety of compounds, including volatile oils (such as pinocamphone and isopinocamphone), flavonoids, and tannins, which have been thought to exert expectorant and mild antiseptic effects.

Despite this traditional use, modern scientific research on hyssop's effectiveness for bronchial support is limited and largely inconclusive. A small number of laboratory studies have investigated the antimicrobial or anti-inflammatory properties of hyssop extracts, but very few clinical trials exist to validate its efficacy specifically for bronchial or respiratory health in humans. Some components of hyssop oil have demonstrated activity against certain pathogens in vitro, but safety concerns (especially with high doses or essential oil use) further limit its application.

In summary, the use of hyssop for supporting the bronchial system is primarily justified by traditional practices rather than strong scientific validation. The evidence rating reflects the lack of robust clinical data, but acknowledges its historical role in herbal medicine.