My mom has chronic cough due to past episodes of bronchitis. The infection was long gone but she continued to have some secretion which caused her cough and woke her up during sleep. I decided to try this since tumeric is anti-inflammatory. She takes 2 capsules/day, and to my delighted surprise, her chronic cough disappeared in half a month.
Also if you have chronic cough, make sure to go over your medication list since it is a major side effect for some meds, such as, angiotensin converting enzyme inhibitors, a common category of hypertension med.