Evidence map›Paper›PMID 40679494›Full record

SynthesisNutrition reviews2026

The Impact of Inorganic Nitrate on Endothelial Function: A Systematic Review of Randomized Controlled Trials and Meta-analysis.

Begum Celik, Esther Muriuki, Gunter G C Kuhnle, Jeremy P E Spencer, Charlotte E Mills

Abstract readSystematic ReviewMeta-Analysis
In one paragraph

Synthesis in Nutrition reviews, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.

0numbers the graph read from it
0cells of the map it votes in
7citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

7 citing papers in PubMed.

  1. Review
  2. Article
  3. Review
  4. Review
  5. Article
  6. Can Beetroot (Nutrients · 2025
    Review
  7. Source-specific nitrate intake and incident dementia in the Danish Diet, Cancer and Health Study.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2025
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Begum CelikHugh Sinclair Unit of Human Nutrition, School of Chemistry, Food and Nutritional Sciences, University of Reading, Reading RG6 6AP, United Kingdom.ORCID 0009-0007-3806-2230
Esther MuriukiHugh Sinclair Unit of Human Nutrition, School of Chemistry, Food and Nutritional Sciences, University of Reading, Reading RG6 6AP, United Kingdom.
Gunter G C KuhnleHugh Sinclair Unit of Human Nutrition, School of Chemistry, Food and Nutritional Sciences, University of Reading, Reading RG6 6AP, United Kingdom.ORCID 0000-0002-8081-8931
Jeremy P E SpencerHugh Sinclair Unit of Human Nutrition, School of Chemistry, Food and Nutritional Sciences, University of Reading, Reading RG6 6AP, United Kingdom.
Charlotte E MillsHugh Sinclair Unit of Human Nutrition, School of Chemistry, Food and Nutritional Sciences, University of Reading, Reading RG6 6AP, United Kingdom.ORCID 0000-0002-8313-3700

Funding

Turkey Ministry of Education
6 · The paper itself

Abstract

contextInorganic nitrate is an exogenous source of nitric oxide, an established regulator of vascular homeostasis via the nitrate-nitrite-nitric oxide pathway. Here, we evaluate the impact of inorganic nitrate on endothelial function, a risk factor for cardiovascular disease.

objectiveA systematic review of the existing literature and meta-analysis was performed. Trials testing inorganic nitrate compared with a control were selected and the change in forearm endothelial function (as assessed by flow-mediated dilatation [FMD]) were included. DATA SOURCES: The following databases were searched: Medline, Web of Science, and Scopus. DATA EXTRACTION AND ANALYSIS: Standardized mean differences in %FMD were pooled using a random-effects model and 13 studies were included in the analysis. Quality assessment was performed using the Cochrane risk-of-bias score.

resultsInorganic nitrate was associated with improved Δ%FMD compared with the control; the standardized mean difference was 1.48% (95% CI: 0.70%-2.27%; P < 0.01); high heterogeneity (I2 = 98.2%) was observed. The significant effect observed remained irrespective of dose (±600 mg nitrate), duration (acute or chronic consumption), health status (± health conditions), and type of nitrate (dietary or nondietary). Notably, acute studies had a greater FMD response than chronic studies (1.93% [95% CI: 0.71%-3.15%] vs 0.90% [95% CI: 0.48%-1.31%]). More than half of the studies reviewed showed low risk of bias; the rest of the studies were classified as "some concern" due to lack of information about randomization process and lack of prespecified analysis plans.

conclusionOur results show that, from a modest number of included trials, inorganic nitrate consumption improves FMD response by more than 1%, a clinically relevant magnitude for the prevention of cardiovascular disease. SYSTEMATIC REVIEW REGISTRATION: PROSPERO registration no. CRD42020191832.

Indexed as

Endothelium, VascularNitratesCardiovascular DiseasesHumansRandomized Controlled Trials as TopicVasodilationNitratesbeetrootcardiovascular diseaseendothelial functionflow-mediated dilationFMDinorganic nitrate

Identifiers

PMID40679494
PMCPMC12696370

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.