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Spinach showdown: does how It's grown affect your blood pressure?

NCT ID NCT07665944

Knowledge-focused Sponsor: University of Plymouth Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether smoothies made from hydroponically grown spinach affect nitrate levels in saliva and blood pressure differently than those made from conventionally grown spinach. Twelve healthy adults will drink both types of smoothies on separate days, with measurements taken before and after. The goal is to see if the growing method changes the health benefits.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Spinach smoothie (hydroponically or conventionally grown)
What this could lead to
If it works, this could show that hydroponic spinach provides similar or better nitrate benefits than conventional spinach, potentially guiding healthier food choices.
What could go wrong
This is a very small (12 participants), early-stage trial measuring short-term effects only. Results may not apply to the general population or long-term health.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 12 people

The number the study aims to enrol. It can still change while the study runs.

Started

May 2026

Expected to finish

Jul 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 60 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adults aged 18-60 years * Generally healthy individuals (no diagnosed chronic disease) * Non-smokers and non-vapers * Not currently taking medications known to affect cardiovascular function or nitrate metabolism * Able and willing to provide informed consent * Willing to comply with study procedures and attend both study visits Exclusion Criteria: * Presence of chronic disease (e.g., cardiovascular, metabolic, renal, or respiratory conditions) * Use of pacemakers or implanted medical devices * Pregnant or lactating individuals * Known allergy or intolerance to spinach * History of gastrointestinal disorders or pathology affecting digestion or absorption * Use of nitrate or nitrite supplements * Use of antibiotics within the past 3 weeks * Use of antibacterial mouthwash or oral products within the past 2 weeks * Current participation in another clinical trial or recent participation that may interfere with outcomes

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Adult

How to take part

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  1. The places running it

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  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

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Contacts and locations

Locations

  • University of Plymouth

    RECRUITING

    Plymouth, Devon, PL4 6AB, United Kingdom

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