Could a seaweed supplement boost blood vessel function?
NCT ID NCT05651230
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tests whether a supplement made from seaweed, called rhamnan sulfate, can improve blood vessel function in middle-aged and older adults who have at least one risk factor for heart disease (like high blood pressure or obesity). Participants take the supplement or a placebo for three weeks each, with a two-week break in between. The goal is to see if this natural compound can help keep blood vessels healthy.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
rhamnan sulfate (a seaweed extract)
What this could lead to
If it works, this could point toward a simple dietary supplement to help protect blood vessels and reduce heart disease risk.
What could go wrong
This is a very small, early-stage trial with only 15 people. Results may not apply to everyone, and the supplement may not improve vascular function as hoped.
Disclaimer
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the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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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.
Contacts and locations
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Locations
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Cardiovascular Aging Research Lab at UT Austin
Austin, Texas, 78712, United States