Patent pending, Berkeley Test is the most affordable and easy-to-use saliva test strip for measuring total body bioavailability of Nitric Oxide, a naturally-produced vascular fitness factor. Used by athletes to 'fine tune' their natural whole food diets in order to optimize their training and race performance. Produced in the body after the consumption of leafy greens, the surrogate marker and precursor for Nitric Oxide is found in saliva: high levels are indicative of increased endurance and elevated performance, while low levels are associated with fatigue and early 'burn out'.