Within Australia, over 4.1 million Australians (which is approx 20% of the entire population!) are affected with allergies with the most prevalent age groups being from ages 15 to 64 years old. Herbal tea won't help serious food based allergy conditions, but what it can be great for is hay fever and pollen related coughing, sneezing and rashes - particularly during springtime.
Herbal tea can, depending on your body type, help to build up immunity and in some cases permanently resolve the issues many suffer from year to year. Also a great tool used by parents to help lessen their children's allergic conditions early on in life, particularly with Nettle Tea.