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The Effects of Nitrate-Rich Mouthwash on Vascular Tone (NITRATONE)

19. mai 2026 oppdatert av: Amina Basic, Göteborg University

The Short-Term Effects of Nitrate-Rich Mouthwash on Oral Bacterial Nitrite Production, Blood Pressure, and Nitrate and Nitrite Concentrations in Plasma and Saliva of Healthy Adults

High blood pressure (hypertension) is a major risk factor for cardiovascular disease. One important contributing factor to high blood pressure is reduced availability of nitric oxide (NO). Therefore, NO is an important molecule in maintaining healthy blood vessel function.

Dietary nitrate, found in leafy greens, can serve as an alternative source of nitric oxide in the body. After ingestion, nitrate is converted to nitrite by bacteria residing in the oral cavity. Nitrite can subsequently be converted to NO when swallowed. Therefore, this nitrate-nitrite-nitric oxide pathway is dependent on oral bacteria.

This study aims to assess whether rinsing the mouth with a nitrate-rich mouth rinse influences blood pressure in healthy adults. Also, concentrations of nitrate and nitrite in plasma and saliva will be measured following the nitrate-mouth rinse exposure.

Studieoversikt

Status

Har ikke rekruttert ennå

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

This study investigates the potential acute blood pressure lowering effects of a simple nitrate-rich mouth rinse and drink, while also monitoring their effects on oral nitrite production capacity (NPC), plasma and salivary nitrate and nitrite levels, oral pH levels and the oral microbiology.

The study is a short-term, double-blind, randomized, placebo-controlled, crossover trial.

Participants will receive interventions and donate samples at four separate sessions. At session (i), baseline measurements are taken prior to intervention, and samples are subsequently taken (as described under outcome measures). At session (i) and (ii), the participants will rinse the oral cavity with a nitrate-rich fluid (or placebo). Similarly for sessions (iii) and (iv), the participants will drink the same fluid (or placebo). When donating samples, the participants will be in fasting condition. In total there will be four sessions per participant with wash-out periods in-between.

To elucidate the short-term effects of the above-described interventions, sampling will be performed in the clinic at multiple time points during the first 2 hours after each intervention, as well as at 24 hours. Participants will also monitor their blood pressure at home at four different time points for all four interventions. No sampling or measurements will be performed during night-time.

For both the intervention and the placebo, potassium (K) salts are used (KNO3 and KCl). For chairside measurement of NPC in oral samples, the rapid Griess assay (RGA) will be used. Blood pressure will be measured at the study facilities as clinic blood pressure and orthostatic blood pressure (CBP and OBP, respectively) using a clinically validated blood pressure monitor. The same device will be used by the participants for home blood pressure measurements (HBP). Saliva pH will be measured using pH-sticks or a pH-meter. Plasma and saliva nitrate- and nitrite levels are analyzed using commercial laboratory kits. Salivary secretion rate (SCR) is recorded during saliva donation, and measured as volume per unit time. Microbiological effects will be analyzed with appropriate methods in the laboratory.

Studietype

Intervensjonell

Registrering (Antatt)

20

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studer Kontakt Backup

Studiesteder

  • Sverige
    • Västra Götaland County
      • Gothenburg, Västra Götaland County, Sverige, 41390
        • Odontologen, University of Gothenburg
        • Ta kontakt med:

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

  • Voksen
  • Eldre voksen

Tar imot friske frivillige

Ja

Beskrivelse

Inclusion Criteria:

  • ≥18 years of age; and
  • clinic blood pressure <140/<90 mmHg.

Exclusion criteria:

  • hypertension;
  • systemic medication (other than the oral contraceptive pill);
  • antibiotic treatment within the last 3 months;
  • active smoking status and BMI > 30;
  • prior gastric by-pass surgery;
  • self-reported use of antiseptic mouthwash or toothpaste;
  • self-reported use of tongue scrapes; and
  • active periodontal disease or caries that needs treatment.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Grunnvitenskap
  • Tildeling: Randomisert
  • Intervensjonsmodell: Crossover-oppdrag
  • Masking: Firemannsrom

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: Test mouth rinse
In this arm participants will receive nitrate rich-mouth rinse
Kosttilskudd: Nitrate-rich mouth rinse
The oral cavity is rinsed with nitrate from mouth rinse, rather than ingested.
Andre navn:
  • Nitrate mouth rinse
Placebo komparator: Placebo mouth rinse
In this arm participants will receive placebo mouth rinse
Kosttilskudd: Placebo
This mouth rinse is devoid of nitrates
Kosttilskudd: Placebo
This drink is devoid of nitrates
Aktiv komparator: Test drink
In this arm participants will receive nitrate-rich drink
Kosttilskudd: Nitrate-rich drink
Nitrate is ingested, rather than rinsed and spit out
Andre navn:
  • Nitrate drink
Placebo komparator: Placebo drink
In this arm participants will receive placebo drink
Kosttilskudd: Placebo
This mouth rinse is devoid of nitrates
Kosttilskudd: Placebo
This drink is devoid of nitrates

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Blood pressure before and at regular intervals within the 24 hours after nitrate exposure.
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Blood pressure will be measured before and with regular intervals after nitrate exposure. The measurements will be registered as systolic and diastolic measurements from clinic blood pressure and home blood pressure.
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Oral nitrite production before and at regular intervals within the 24 hours after nitrate exposure.
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure
The nitrite production is measured using the rapid Griess assay (RGA) - a chairside semi-quantitative nitrite concentration estimation tool for use in several different oral samples. The RGA provides nitrite estimation on a grading scale of 0-5 with nitrite concentrations intervals.
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Plasma and salivary nitrate and nitrite levels before and after nitrate exposure.
Tidsramme: Baseline (prior to nitrate exposure) and 1 hour after nitrate exposure.
Blood samples are drawn from venous blood before and 1 hour after nitrate exposure, and plasma is separated. Saliva nitrate/nitrite is extracted from saliva samples donated before and 1 hour after nitrate exposure. Both are analyzed using commercial laboratory kits.
Baseline (prior to nitrate exposure) and 1 hour after nitrate exposure.
Salivary pH levels at regular intervals.
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Salivary pH will be measured using a pH-stick at regular intervals before and after nitrate exposure.
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Orthostatic blood pressure before and at regular intervals within the 24 hours after nitrate exposure.
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Orthostatic blood pressure will be measured at regular intervals before and after nitrate exposure and reported as systolic and diastolic blood pressure values in mmHg.
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Salivary secretion rate before and after nitrate exposure.
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Salivary secretion rate will be registered as volume per unit time when donating saliva before and after nitrate exposure with regular intervals.
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Relative abundance in cultivable oral microbial composition after nitrate exposure
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Microbial samples from multiple oral sites will be collected before and after nitrate exposure. Oral microbial composition will be analyzed and reported as the relative abundance (%).
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Absolute abundance in cultivable oral microbial composition after nitrate exposure
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Microbial samples from multiple oral sites will be collected before and after nitrate exposure. Cultivable oral microbial composition will be analyzed and reported as absolute abundance and expressed as colony-forming units per milliliter (CFU/mL).
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
PCR detection of specific oral bacterial after nitrate exposure
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Microbial samples from multiple oral sites will be collected before and after nitrate exposure. Quantitative PCR analysis will be performed for selected oral bacterial species and reported as bacterial counts or copy numbers.
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Oral microbial metabolite concentrations after nitrate exposure
Tidsramme: Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.
Microbial samples from multiple oral sites will be collected before and after nitrate exposure. Oral microbial metabolites will be analyzed and reported as metabolite concentration values.
Baseline (prior to nitrate exposure) and during the 24 hours after nitrate exposure.

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Göteborg University

Etterforskere

  • Hovedetterforsker: Amina Basic, PhD, DDS, Göteborg University

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Antatt)

1. april 2026

Primær fullføring (Antatt)

1. desember 2028

Studiet fullført (Antatt)

1. desember 2028

Datoer for studieregistrering

Først innsendt

29. desember 2025

Først innsendt som oppfylte QC-kriteriene

19. mai 2026

Først lagt ut (Faktiske)

22. mai 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

22. mai 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

19. mai 2026

Sist bekreftet

1. desember 2025

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Andre studie-ID-numre

  • 2025-02639-01

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

NEI

Legemiddel- og utstyrsinformasjon, studiedokumenter

Studerer et amerikansk FDA-regulert medikamentprodukt

Nei

Studerer et amerikansk FDA-regulert enhetsprodukt

Nei

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