Siim Land: This Made Everyone Worried About Omega-3s and Dementia

ByLongevity Notes Editorial
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Peer-Reviewed Research
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Siim Land

Video Summary · May 11, 2026

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Key Takeaways

  • Continue taking omega-3s – The study linking omega-3s to cognitive decline was observational and contradicted higher-quality evidence.
  • Prioritize high-quality omega-3 supplements – While even oxidized fish oil showed no harm in studies, pharmaceutical-grade products are still preferable.
  • Focus on dosage – Research shows cognitive benefits at 2,000 mg/day of omega-3s (EPA/DHA).
  • Ignore sensational headlines – The totality of evidence (including RCTs) shows omega-3s are neuroprotective.

Supplements & Protocols Mentioned

  • Omega-3 supplements – Effective dose: 2,000 mg/day of EPA/DHA for cognitive benefits.

Notable Quotes

“The totality of evidence matters more than a single study.”

“There’s no evidence that omega-3 supplements would prevent or treat Alzheimer’s Disease or dementia, but there’s also no evidence that the omega-3s would harm cognition.”

Bottom Line

Keep taking high-quality omega-3 supplements at 2,000 mg/day – the recent negative study was flawed observational research, while controlled trials confirm cognitive benefits.

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Medical Disclaimer

This article is for informational purposes only and does not constitute medical advice. The research summaries presented here are based on published studies and should not be used as a substitute for professional medical consultation. Always consult a qualified healthcare provider before making any changes to your health regimen.

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