Nettle leaf can be very effective at treating seasonal and chronic allergies. It acts as a natural antihistamine, thus blocking your body’s ability to produce histamines. It acts the same way as Over-The-Counter anti-histamines do, but in a more mild and natural way than chemically produced medicines. It will offer great relief from many allergy symptoms. You can either boil some water and make some tea out of the dried leaves or a more practical approach would be to supplements with nettle capsules, which are more concentrated and are easier to ingest. The only thing would be to make sure to use a standardized extract so that you know the quality and quantity of what you’re taking. Also, check with your doctor to make sure it is appropriate for you.