Boswellia, also known as frankincense, has a long history of traditional use in Ayurvedic and other traditional medicine systems for supporting respiratory health, including the sinuses. The resin from Boswellia serrata contains boswellic acids, which are believed to have anti-inflammatory properties. In traditional practices, Boswellia is used to help alleviate symptoms of sinus congestion, rhinitis, and upper respiratory tract inflammation, often in the form of herbal preparations or inhalations.

However, modern scientific studies specifically investigating Boswellia for sinus health are limited. Most clinical research has focused on its use for osteoarthritis, inflammatory bowel disease, and asthma. While its anti-inflammatory effects may theoretically benefit sinus-related inflammation, direct evidence for efficacy in sinus conditions is sparse. A few small studies and anecdotal reports suggest possible benefit for allergic rhinitis, but these are not robust enough to draw firm conclusions.

Overall, the use of Boswellia for sinus support is primarily justified by tradition rather than rigorous scientific validation. The evidence rating is moderate (2/5) due to the plausible anti-inflammatory mechanism and historical precedent, but a lack of targeted clinical trials for sinus health.