It just works!
I feel this product has been very beneficial to me and my current fitness goals.  It seems to help with breathing.  Since using this product I am trimming time off my pace while training for a marathon.  This far I have trimmed off 45 sec/mile in the last month.  I do not feel jittery after taking this product.  While I do feel I have more energy after taking it, I am still more impressed with how it assists my body with using oxygen.
Rating: 5 stars