Rosmarinic acid is a natural compound found in rosemary, lemon balm, and other herbs. People take it to boost the body's antioxidant defenses and help maintain a normal inflammatory response.
Some use this compound for seasonal respiratory comfort or to support skin health. Capsules and extracts are the usual forms, often taken alongside meals.
Large doses sometimes cause mild stomach discomfort. Researchers have not thoroughly studied its safety during pregnancy or while breastfeeding.