The Claim
Daily intake of high-polyphenol rooibos tea for six weeks increases flow-mediated dilation by 22% in adults with metabolic syndrome, from 5.18% to 6.32%, compared to a 4% increase in the control group from 5.23% to 5.44%.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Adults with metabolic syndrome who drank high-polyphenol rooibos tea daily for six weeks experienced a 22% increase in blood vessel function measured by flow-mediated dilation, while those who did not drink the tea saw only a 4% increase.
See the scientific wording
Daily intake of high-polyphenol rooibos tea for six weeks improves endothelial function, as measured by flow-mediated dilation, increasing it by 22% (from 5.18% to 6.32%) in adults with metabolic syndrome, while the control group showed only a 4% increase (from 5.23% to 5.44%), indicating a probable direct benefit on vascular health.
Compounds in rooibos tea enter the bloodstream and reduce oxidative stress in blood vessel walls, allowing more nitric oxide to be produced and used. This nitric oxide tells the blood vessels to relax and widen, improving blood flow.
What the research says
1 studyThis study found that people with metabolic syndrome who drank a special kind of rooibos tea every day for six weeks had better blood vessel function than those who didn’t. That means their blood vessels got better at opening up when needed, which is good for heart health.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.