Fiber fix for fragile bones? new study tests supplement in older men
NCT ID NCT06519877
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study tests whether a dietary fiber supplement (soluble corn fiber) can help older men absorb more calcium and improve bone health. Thirty male veterans aged 60 and older will take the fiber supplement and then have their calcium absorption measured. The goal is to see if changing the gut bacteria with fiber can strengthen bones and reduce fracture risk.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- soluble corn fiber (a type of dietary fiber)
- What this could lead to
- If it works, this could point toward a simple dietary supplement to help prevent bone loss and fractures in older men.
- What could go wrong
- This is a small, early-phase study with only 30 participants, so results may not apply to everyone. The effect on actual fractures is not being measured directly.
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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Phase 2
Tests whether the treatment actually works, and watches for side effects, in a larger group.
- Participants
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About 30 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Jan 2025
- Expected to finish
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Jan 2029
An estimate. End dates often move.
- Lead sponsor
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A government agency
The lead sponsor is a US federal agency other than the NIH.
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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60 years and older
- Sex
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Male 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: * Male Veterans 60 years of age Exclusion Criteria: * History of malabsorption * Hypercalcemia (corrected Ca \> 10.2 mg/dL) * Vitamin D insufficiency (25OHD \< 30 ng/mL) * Chronic kidney disease stage 3B or worse (CrCl \< 45 mL/min) * Severe hypogonadism (AM fasting serum total testosterone \< 150 ng/dL) * Daily use of proton pump inhibitor * Use of medication(s) known to affect calcium metabolism * Use of medications or supplements that could impact gut microbiota in the previous 3 months (antibiotics or commercially available probiotics or prebiotics. * Presence of a condition or abnormality that in the opinion of the Investigator that would compromise the safety of the patient or the quality of the data.
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Conditions
The condition(s) this trial relates to.
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
1 site. 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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San Francisco VA Medical Center, San Francisco, CA
RECRUITINGSan Francisco, California, 94121-1563, United States
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