I have recently trialed myself and two other friends the Circ O2. Results have been remarkable. We have all noticed a massive difference in our energy levels through out the day. Clearly we have all been in need of the product. Interestingly we are 3 different types of people also. 1 early 20's Healthy Male, 1 48 year old healthy and fit female, mother of 1, which is me and my colleague Mid 50's female with a variety of health issues. Yet all 3 of us found the product remarkable.