Certain plants consumed in the form of herbal teas, hot or cold, are renowned for their antihistamine properties. This is particularly the case of nettle, peppermint and lanceolate plantain. They help calm any type of irritation. Tarragon is a plant that helps fight against allergens such as pollen, it fights in particular against respiratory allergies. Just swallow 2 drops of tarragon essential oil diluted in a teaspoon of olive oil 3 times a day when the allergy occurs.