Fish oil helps memory only if your blood is low in a certain chemical
Homocysteine Status Modifies the Treatment Effect of Omega-3 Fatty Acids on Cognition in a Randomized Clinical Trial in Mild to Moderate Alzheimer’s Disease: The OmegAD Study
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Omega-3 supplementation improved cognitive function in only a subset of Alzheimer’s patients—those with low homocysteine—while showing zero benefit in others.
Most public messaging treats omega-3 as a general brain booster; this shows it’s ineffective for half the population based on a simple blood marker.
Practical Takeaways
If you or a loved one has early Alzheimer’s and is considering omega-3 supplements, ask a doctor for a homocysteine blood test—levels below 11.7 μmol/L may mean it could help.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Omega-3 supplementation improved cognitive function in only a subset of Alzheimer’s patients—those with low homocysteine—while showing zero benefit in others.
Most public messaging treats omega-3 as a general brain booster; this shows it’s ineffective for half the population based on a simple blood marker.
Practical Takeaways
If you or a loved one has early Alzheimer’s and is considering omega-3 supplements, ask a doctor for a homocysteine blood test—levels below 11.7 μmol/L may mean it could help.
Publication
Journal
Journal of Alzheimer's Disease
Year
2019
Authors
F. Jernerén, Tommy Cederholm, H. Refsum, A. Smith, C. Turner, J. Palmblad, M. Eriksdotter, E. Hjorth, G. Faxén-Irving, L. Wahlund, M. Schultzberg, H. Basun, Y. Freund-Levi
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Claims (3)
Taking omega-3 supplements every day for six months doesn’t seem to help people with mild to moderate Alzheimer’s think better, no matter what their blood homocysteine levels were to begin with.
For people with early-stage Alzheimer’s, taking a specific fish oil supplement for 6 months might help them think a little better and function more normally—but only if their blood has low levels of a chemical called homocysteine before they start.
If you have Alzheimer’s and your blood has high levels of a substance called homocysteine, taking omega-3 fish oil supplements might help your memory and thinking skills a bit—but only if you look at certain tests, not all of them.