Pads vs. tampons vs. cups: which is best for your vaginal bacteria?
NCT ID NCT06646185
First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study looks at how using pads, tampons, or menstrual cups for two cycles each changes the bacteria in the vagina. One hundred women in Peru, Cameroon, and Switzerland will try all three products in a random order over six months. The goal is to see which product is linked to a healthier bacterial balance.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- What this could lead to
- If successful, this could help women choose menstrual products that support a healthy vaginal microbiome.
- What could go wrong
- This is a small, early-stage observational study with no control group, so results may not apply to all women or lead to clear recommendations.
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
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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
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About 100 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Apr 2026
- Expected to finish
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Dec 2026
An estimate. End dates often move.
- Lead sponsor
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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
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18 to 35 years
- Sex
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Female participants only
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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: * able to provide informed consent; * aged 18-35; * residing in the recruitment region and expecting to reside in the same region for at least six months following recruitment (Yaoundé/ Gounougou, Cameroon; Loreto/Lima/Maynas provinces, Peru; or Basel-Landschaft and Basel-Stadt cantons, Switzerland); * are native speakers or are able to read and understand one of the following languages in each respective country (German, French, Italian, English or Spanish in Switzerland; French or English in Cameroon; Spanish in Peru); * had menstrual cycles of 21-35 days for at least the last 4 months; * had menses which lasted at least 3 days for at least the last 4 months. Exclusion criteria: * experienced a menstrual abnormality with any of the menstrual cycles in the last 4 months (such as oligomenorrhea or amenorrhea, or bleed more than 7 days a month); * are pregnant or actively trying to become pregnant; * are breastfeeding; * used antibiotics and/or vaginal antifungals in the last 30 days prior to recruitment; * had a vaginal birth in the last 6 months; * vaginal surgery, perineal surgery, uterine surgery, miscarriage or abortion in the last 6 months; * history of Toxic Shock Syndrome ; * positive to detection of the toxic shock syndrome toxin-1 gen (tst) using Polymerase Chain Reaction (PCR); * Intrauterine device in situ; * under medication (treatment against infectious or chronic disease) at the time of recruitment or during the 3 weeks prior to recruitment; * clinical symptoms of vaginal infection; * smoker.
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Genom att skicka in godkänner du våra Användarvillkor
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
3 sites in 3 countries. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Centre de Recherche sur les Maladies Emergentes et Re-Emergentes
RECRUITINGYaoundé, Yaoundé, 3, Cameroon
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Swiss Tropical and Public Health Institute
RECRUITINGAllschwil, Allschwil, 4123, Switzerland
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Universidad Nacional de la Amazonia Peruana
RECRUITINGIquitos, Iquitos, 16007, Peru