Does hesperetin stimulate nitric oxide production from vascular endothelium, and does oral hesperidin therapy improve endothelial function and reduce inflammatory markers in individuals with metabolic syndrome?
Hesperidin Citrus Flavonoid, a randomized crossover trial in 24 individuals (J Clin Endocrinol Metab 2011, PMID 21346065) — in the clinical study, hesperidin treatment increased flow-mediated dilation (10.26% vs. 7.78% with placebo) and reduced concentrations of high-sensitivity C-reactive protein, serum amyloid A protein, and soluble E-selectin. The clinical trial was exploratory with a small sample size (n=24) and a relatively short intervention period (3 weeks).
Source: J Clin Endocrinol Metab 2011, PMID 21346065 ↗ · Research map · How Magellan grades evidence · evidence confidence: high
J Clin Endocrinol Metab · 2011 · PMID 21346065 · DOI 10.1210/jc.2010-2879
Hesperidin improves blood vessel function and reduces inflammation in people with metabolic syndrome, potentially through its metabolite hesperetin stimulating nitric oxide production.
The question
Does hesperetin stimulate nitric oxide production from vascular endothelium, and does oral hesperidin therapy improve endothelial function and reduce inflammatory markers in individuals with metabolic syndrome?
What they tested
Hesperetin, a citrus flavonoid metabolite, may stimulate nitric oxide production and improve vascular function, while oral hesperidin therapy may improve endothelial function and reduce inflammatory markers in subjects with metabolic syndrome.
How they did it
Cellular mechanisms of hesperetin were studied in bovine aortic endothelial cells (BAEC) in primary culture. A randomized, placebo-controlled, double-blind, crossover trial was conducted in 24 individuals with metabolic syndrome, who received oral hesperidin (500 mg once daily for 3 weeks) or placebo. Brachial artery flow-mediated dilation and circulating inflammatory biomarkers were measured.
What they found
In BAEC, hesperetin acutely stimulated phosphorylation of Src, Akt, AMP kinase, and endothelial NO synthase, leading to NO production, which required H2O2. Hesperetin pretreatment reduced monocyte adhesion to BAEC and vascular cell adhesion molecule-1 expression induced by TNF-α. In the clinical study, hesperidin treatment increased flow-mediated dilation (10.26% vs. 7.78% with placebo) and reduced concentrations of high-sensitivity C-reactive protein, serum amyloid A protein, and soluble E-selectin.
| Placebo | 7.78 | |
|---|---|---|
| Hesperidin | 10.26 |
Flow-mediated dilation was significantly higher after hesperidin treatment compared to placebo in individuals with metabolic syndrome.
What it means
Hesperetin has vasculoprotective actions, including stimulating NO production and reducing inflammation in endothelial cells. Oral hesperidin treatment improves endothelial dysfunction and reduces circulating inflammatory markers in individuals with metabolic syndrome.
Limitations
The clinical trial was exploratory with a small sample size (n=24) and a relatively short intervention period (3 weeks).
The paper at a glance
| Title | Citrus polyphenol hesperidin stimulates nitric oxide production while improving endothelial function and reducing inflammatory markers in metabolic syndrome |
|---|---|
| Journal | J Clin Endocrinol Metab |
| Year | 2011 |
| PMID | 21346065 ↗ |
| DOI | 10.1210/jc.2010-2879 ↗ |
| Topic | Cardiovascular & vascular aging |
Read the source: PubMed record (authors, abstract, full citation) ↗ · Publisher via doi.org ↗
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Hesperidin Citrus Flavonoid
In human trials, hesperidin or hesperidin-rich orange juice has improved endothelial function and postprandial microvascular reactivity, modestly lowered blood pressure in some studies — including a 159-person trial showing dose-dependent systolic and pulse-pressure reductions with sustained intake — and reduced…
Hesperidin is a flavanone glycoside (a citrus bioflavonoid) found abundantly in oranges, lemons, and…
Research describes the compound or intervention studied. It is not a claim about any specific product.
Molecules & mechanisms in this paper
Each of these is named in the paper’s own words above. Open the monograph for the full mechanism and its other citations.
Cite this page
These citations point at this summary. To cite the original paper with its full author list, use the PubMed record or doi.org.
Magellan Longevity. (2026). Does hesperetin stimulate nitric oxide production from vascular endothelium, and does oral hesperidin therapy improve endothelial function and reduce inflammatory markers in individuals with metabolic syndrome? [Plain-English summary of J Clin Endocrinol Metab 2011, PMID 21346065, DOI 10.1210/jc.2010-2879]. Magellan Longevity. https://magellanlongevity.com/study/d21346065.html@misc{magellan_d21346065,
title = {Does hesperetin stimulate nitric oxide production from vascular endothelium, and does oral hesperidin therapy improve endothelial function and reduce inflammatory markers in individuals with metabolic syndrome?},
author = {{Magellan Longevity}},
year = {2026},
howpublished = {\url{https://magellanlongevity.com/study/d21346065.html}},
note = {Plain-English summary of PubMed PMID 21346065; DOI 10.1210/jc.2010-2879; J Clin Endocrinol Metab 2011. Reviewed by Gabriel Radu, DO},
urldate = {2026-08-11}
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