After reading a few articles on how cordyceps may help with COPD, I thought I would give it a try. I'm an ex-smoker of over forty years and have COPD. According to the Chinese, they have been using cordyceps to cure a bunch of respiratory illnesses for years with amazing success. I'm just about to turn 75 and have a number of health issues so why not. I ordered mine from Puritan as I feel their the most reliable. Well, I certainly don't want to mislead anyone, but after a few pills it got rid of my persistent bronchitis and cough. I'm still a little hesitant to declare any kind of victory, but I'm thrilled if it did only that. I'm following the recommended dosage without any noticeable side effects and am going to increase it gradually to see if it will helpmy breathing.