I have used Pe Min Kan Wan for 6 years and have had fantastic results. You take it 3 pills 3x a day and feel the effects in 3 days. I take about 4 weeks worth in March to prepare myself for the allergy season. Airbourne allergies are no longer a problem to me. I get these at Chinese herbal stores...there are different types. It is mostly herbal...some have trace amounts of 'Western' medicines. This is a grerat product for people with year round problems!