What Are Fish Oil Supplements Good For? Here’s Your Crash Course
Nearly half of the participants (47 percent) carried the APOE ε4 allele, the strongest genetic risk factor for late-onset Alzheimer's disease. All participants consumed less than 200 mg of DHA per day through their diet.Participants were randomly assigned to one of two groups. One group received a daily supplement containing 2,000 mg of DHA, while the other received a placebo for 24 months.
- ▪Nearly half of the participants (47 percent) carried the APOE ε4 allele, the strongest genetic risk factor for late-onset Alzheimer's disease.
- ▪All participants consumed less than 200 mg of DHA per day through their diet.Participants were randomly assigned to one of two groups.
- ▪One group received a daily supplement containing 2,000 mg of DHA, while the other received a placebo for 24 months.
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Ritsuko KawaiScienceJul 5, 2026 6:00 AMFish Oil Supplements May Not Help Stave Off Dementia After AllA large-scale clinical trial has shown that even long-term consumption of DHA—an omega-3 fatty acid found in abundance in oily fish—may not lead to improvements in cognitive function.Photograph: batuhan toker/Getty ImagesCommentLoaderSave StorySave this storyCommentLoaderSave StorySave this storyDocosahexaenoic acid (DHA), an omega-3 fatty acid found in abundance in oily fish such as mackerel and sardines, is thought to improve cognitive function by supporting connections between brain cells.
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