Abstract: Compositions and methods for improving nitric oxide levels in a subject, comprising administering to a subject, a composition comprising dietary nitrate derived from potassium nitrate, beet root (whole plant, powder, plant extract), and/or nitrate-rich leafy green portions (whole plant, powder, plant extract) that improve functional nitric oxide levels in subjects as shown by increasing salivary bioconversion of nitrate to nitrite, a necessary a required step for nitric oxide mediated health benefits. The disclosed novel compositions improve cardiac health, lowers blood pressure, intraocular pressure, and LDL and restores nitric oxide mediated cardiovascular benefits, including but not limited, restoring endothelium function and improving flow mediated dilation.

Abstract: A single device to collect, transfer, and measure salivary nitric oxide analyte and metabolite, nitrite, a biomarker for nitric oxide, as well as, a method to assess the effects of diet and exercise on changing an individual's nitric oxide status and health.