What it is
Perilla frutescens is an aromatic herb native to East Asia whose seed and leaf extracts are rich in rosmarinic acid — a polyphenolic compound with potent anti-allergic, anti-inflammatory, and antioxidant properties. A randomised double-blind trial demonstrated that rosmarinic acid-enriched perilla extract significantly improved seasonal allergic rhinoconjunctivitis symptoms and reduced inflammatory mediators in nasal lavage fluid.