The herb butterbur (Petasites hybridus), which comes from a European shrub, shows potential for relieving seasonal allergy symptoms. In one Swiss study, butterbur was just as effective as the antihistamine Allegra for reducing allergy symptoms.
This flavonoid, which is found naturally in onions, apples, and black tea, has anti-inflammatory properties and has been shown in research to block histamines.
The roots and leaves of the stinging nettle plant (Urtica dioica) have been used to treat everything from joint pain to prostate problems. Although some people use freeze-dried stinging nettle leaves to treat allergy symptoms, there isn’t much research to show that it works.
Nasal irrigation with a combination of warm water, about a quarter-teaspoon of salt, and a quarter-teaspoon of baking soda may help clear out mucus and open sinus passages. You can administer the solution through a squeeze bottle or a neti pot — a device that looks like a small teapot