Aresify medical grade mullein extract, FDA compliant formula, highly effective for a variety of respiratory conditions. For this reason, doctors and pulmonologists highly recommend Mullein extract to their patients when needed. MedLife Mullein extract's all-natural approach makes it suitable for relieving symptoms of asthma, COPD, smoker's cough, bronchiectasis, cystic fibrosis, emphysema, pneumonia and many other respiratory conditions. Although mullein extract has no known side effects, you should always consult your doctor to ensure that mullein extract is suitable for you.