Could a seaweed supplement boost blood vessel function?

NCT ID NCT05651230

Completed Disease control Sponsor: University of Texas at Austin Source: ClinicalTrials.gov ↗

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.

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

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Conditions

The condition(s) this trial relates to.

cardiovascular disorder

As listed by the trial registrant

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

CARDIOVASCULAR DISEASES

Contacts and locations

Locations

Cardiovascular Aging Research Lab at UT Austin

Austin, Texas, 78712, United States

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