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Breathe Easier with Peppermint. Peppermint contains the substance rosmarinic acid, which has several actions that are beneficial in asthma. In addition to its antioxidant abilities to neutralize free radicals, rosmarinic acid has been shown to block the production of pro-inflammatory chemicals, such as leukotrienes.
Background. 1  The herb peppermint, a natural cross between two types of mint (water mint and spearmint), grows throughout Europe and North America. Both peppermint leaves and the essential oil from peppermint have been used for health purposes. 2  Mint has been used for health purposes for several thousand years.