Although peppermint is not poisonous, overuse can cause discomfort. Peppermint should be used sparingly, especially by people who are prone to heartburn.

Peppermint contains no toxins
You can safely harvest and enjoy peppermint even after it has bloomed. Unlike other herbs, the leaves do not accumulate excessive amounts of essential oils.
The herb is often used as a tea or oil for complaints such as:
- Stomach and intestinal cramps
- colds
- a headache
- sleep problems
However, peppermint can increase heartburn symptoms. The essential oils have an irritating effect on the walls of the stomach, so even healthy people can have problems after too much peppermint. This is especially true of peppermint oil, which should never be taken undiluted.
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In the wild, peppermint can easily be confused with the very poisonous pennyroyal. The plants look very similar and exude the same aroma. However, pennyroyal is rarely found today.
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