Peppermint Leaf Extract and other mint plants have long been used in traditional medicine. It is widely used as a conditioning agent in skin and hair care products. At least one study indicates the potential for peppermint essential oil as an effective inhibitor of microorganisms. This testing should not be considered conclusive, but peppermint oil has been found to be non-phototoxic, non-mutagenic and non-carcinogenic.

When used on the skin in high concentraction, those with sensitivity to peppermint may experience allergic reactions, as with any substance. These can manifest as a rash, hives or contact dermititis. However, when tested using a maximization protocol, it was found not to be a sensitizer. 

Oral consumption of high doses of peppermint can have health consequences, including headache, dizziness, heartburn, slowed heart rate and tremors. Even higher doses can result in muscle weakness brain damage and seizure.

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