I bought this product for my mother, as she had been a smoker for many, many years, and as a result has ended up with COPD and emphysema. She is on her 2nd bottle, and she says she has noticed a difference. I, being her caregiver have also noticed a difference especially when she has her shower day, she doesn't seem as winded. So, we/I will continue buy/use the product until she says she doesn't notice anything anymore. So, thank you for a great product.