Peppermint contains volatile oil 1 to 3%, the oil contains menthol (menthol) about 80%, followed by menthone, isomenthol, pinene and so on. It has a stimulating effect on the digestive tract and an inhibitory effect on the medullary center and the heart. Menthol 20 ml can cause serious poisoning. Poisoning is often caused by overdose

Menthol and peppermint oil of peppermint leaves also have a strong paralyzing effect on mammals, and if consumed too much can lead to respiratory paralysis, and the most serious can even cause death.

Therefore, it is recommended that you only use mint leaves as a flavoring or spice during the summer months, and do not consume too many mint leaves.