Study
SIRT6 activator fucoidan extends healthspan and lifespan in aged wild-type mice
An unreviewed preprint reports that fucoidan, a brown-seaweed polysaccharide, extended median lifespan in aged male mice, reduced frailty in both sexes, and lowered epigenetic age, acting through SIRT6.
Summary Can a seaweed compound help older mice live longer and stay healthier? Show / hide ↓
Researchers gave fucoidan, a compound from brown seaweed, to aged male and female mice. These were ordinary mice without a special disease-causing genetic change. Treated male mice had a longer median lifespan, meaning the age when half the mice had died. Both sexes showed less frailty, meaning fewer signs of weakness, and had lower epigenetic age, a DNA-based estimate of biological aging. Lab tests suggested fucoidan increased SIRT6, a protein involved in cell maintenance, and reduced LINE1, repeated DNA sequences linked with aging-related damage. This was an unreviewed preprint, and no humans took part.
What this means for you: This does not show that fucoidan extends human life. Do not buy a supplement based on this study, especially because the finding has not been independently confirmed and the mouse dose may be much higher than typical commercial doses.
early evidenceThis is a preprint, not yet through peer review as of the source date. The team, led by Yousin Suh with collaborators including Paul Robbins, administered fucoidan to aged wild-type mice. The reported results: a significant increase in median lifespan in male mice, a marked reduction in frailty in both male and female mice, and a reduction in epigenetic age. The paper also reports that fucoidan activates SIRT6's mono-ADP-ribosylase (mADPr) activity in addition to its previously known deacetylase activity, and that fucoidan-treated mice show repression of LINE1 retrotransposon elements, a marker tied to genomic instability in aging. The authors note fucoidan-rich brown seaweed is a dietary staple in South Korea and Japan, countries with high life expectancy, and propose this as circumstantial support for fucoidan as a safe SIRT6-activation strategy. Independent review coordinated by Life Science Editors Foundation flagged this as a notable finding but it has not been replicated and has not passed formal peer review. This is animal, not human, data, and the human-equivalent dose implied by the mouse dosing has been estimated elsewhere as substantially higher than commercial supplement doses currently sold.
As brown seaweed rich in fucoidan is a popular food item in South Korea and Japan, countries with the highest life expectancy, we propose that fucoidan supplementation should be explored as a safe strategy for activating SIRT6 and improving human healthspan and lifespan.
Unreviewed preprint as of the source date; results have not been independently replicated. Mouse lifespan extension does not guarantee equivalent human effect. Population-level dietary correlation with Japanese and Korean life expectancy is not evidence of causation and ignores confounding factors in those populations' diets and healthcare systems.
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