Cowslip (Primula veris) has a long history of use in traditional European herbal medicine, particularly for supporting the respiratory system, including the bronchial tract. The flowers and roots of cowslip have been used in folk remedies for coughs, bronchitis, and other respiratory ailments. Historical texts and herbal compendia, such as those from the 19th and early 20th centuries, describe cowslip as an expectorant and soothing agent for coughs and congestion. The herb contains compounds like saponins, which are thought to help thin mucus and make it easier to expel, and flavonoids, which may have mild anti-inflammatory properties. However, modern scientific studies specifically evaluating cowslip for bronchial support are limited. Some small clinical studies and reviews reference the use of cowslip in combination herbal products for respiratory tract infections and cough, but most evidence remains anecdotal or based on traditional practice rather than rigorous clinical validation. As a result, while cowslip’s use for bronchial support is well documented in traditional medicine, robust scientific evidence remains limited, justifying a moderate evidence rating.