I have used your product before for bronchitis and have had good success with it. I stopped using it because my condition had resolved and I am now off my inhalers thanks to this and quercetin. Approx 2 weeks ago I started having an irregular heart rate, which I suspect was PVC's. I am unsure what was causing, whether it was electrolytes or some sort of calcification or ischemia. That said I thought I would try serrapeptase again as I know it has beneficial effects for heart health. After just 3 days of taking 120,000 twice a day I am happy to report that the palpitations have stopped. Having worked in the medical field for years, I am strong believer in naturopathic supplements. In this case I believe that the product has worked for me. I will continue to supplement within the coming months. Thanks again.