I started off using CircO2 for the increased nitric oxide production promised to help my blood vessels to be plaque free. My relatives, including my mom and dad, had a high incidence of strokes. But, I also have noticed the increased cognition I seem to have now after 3 months of using CircO2. After about 3 weeks of using this product, I noticed my brain being better aware of things and able to delineate details better like it did when I was younger. I have made it a point to keep a background survey of my thought processes going as much as possible. The former brain cloudiness that seemed to be present 85% of the time seems to be there only 10-15% of the time now. My recent memory has really improved. I thought its decline had been an old age thing, but this product has given me hope. I can’t be sure if it is keeping my arteries clear or not, but my blood pressure has remained normotensive. I have only been taking this product once a day, but I never miss a day of taking my lozenge! I am considering taking the lozenge twice a day for a month to see if I feel any more improvement than I already do. Thank you for this product that helps me.