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Standardized to 70% CarvacrolHerbal SupplementApproved by Michael Tierra L.Ac O.M.D.Planetary Herbals Oil of Oregano is from wild-crafted true oregano (Origanum vulgare) an aromatic herb that is native to the Mediterranean region. Traditionally oregano was used to support digestive and respiratory health. In vitro research indicates that carvacrol an active constituent of oil of oregano may provide support to the immune system. Planetary Herbals Oil of Oregano is one of the most potent on the market and is standardized to 70% carvacrol.