Fish oil changed selected blood markers without establishing cardiovascular protection
A trial in middle-aged and older adults found larger declines in selected inflammatory markers with one fish-oil dose; other vascular markers showed no clear between-group differences.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The trial found larger reductions in selected inflammatory blood markers with the lowest fish-oil dose than with control. It did not find significant between-group differences in the other measured vascular markers. These laboratory findings do not demonstrate fewer cardiovascular events, and they do not establish that the lowest dose works better than higher doses.
This abstract-based assessment is limited to blood markers over a short trial. Direct dose-to-dose effect estimates and confidence intervals are not provided, so a preferred dose cannot be established.
What researchers found
Change in ICAM-1, an inflammatory blood marker
Percentage change over 12 weeks: 1 g of fish oil daily versus 0 g control. These are biomarker changes, not cardiovascular-event reductions.
What changed
Blood samples were collected before and after supplementation. The reported between-group differences involved ICAM-1 and MCP-1, described as endothelial inflammatory markers; the abstract did not report clinical cardiovascular outcomes.
Why the comparison matters
Some markers changed from baseline within individual dose groups. Such changes do not show that supplementation outperformed control; the abstract reports no significant between-group differences for the other vascular markers.
The original publication
Effects of fish oil supplementation on biomarkers of vascular endothelial function in middle-aged and older adults: a randomized controlled trial.
Quan C, Tang W, Qin Y et al.
Food Funct · 2026
- PubMed ID
- 41568898
- Record checked
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