In three separate studies, researchers assigned healthy volunteers to either <span style = 'background-color: #dae8f4'>potassium</span>
nitrate (in doses ranging from 248 mg up to 1488 mg), <span style = 'background-color: #dae8f4'>potassium</span> chloride
, low-nitrate water, plain water, or 250 ml of
beetroot juice (roughly 8.5 ounces of
the dark purple punch).
The researchers took blood samples and blood pressure readings at the start of
the study, and at regular intervals for the following 24 hours.