Quercetin is a bioflavonol found naturally in apples, onions, and many other fruits and vegetables. Research published in the Journal of Nutrition (November 2007; Vol. 137) explored whether quercetin supplementation might influence blood pressure in adults with elevated readings.
The study included 41 participants—
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22 hypertensive adults with an average blood pressure of 146/96, and
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19 pre-hypertensive adults averaging 137/86.
Participants received 730 mg of quercetin per day. By the end of the study, average blood pressure decreased by:
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7 mmHg systolic, and
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5 mmHg diastolic.
These reductions are consistent with changes often seen in early lifestyle or nutritional interventions.
Additional findings published in Atherosclerosis (September 2007) suggested that quercetin and its metabolites may help support vascular health by influencing inflammatory pathways in the endothelial cells that line blood vessels. This line of research reflects growing interest in the potential cardiovascular benefits of polyphenol-rich foods.
