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Carnosol is a naturally occurring phyto polypheno or phenolic diterpene, which can show a broad spectrum of applications as a an antioxidant, anticancer agent and anti-inflammatory agent. Carnosol is one of the phenolic antioxidants present in extracts of the herb rosemary (Rosmarinus officinalis). Carnosol inhibits the formation of tumors derived using irritants such as TPA and DMBA in murine models of carcinogenesis. The effective dose reported is 1-10 μM topically or 6 μg/ml when added to supernatants of cultured cells.