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ingestible · for cognitive decline & brain aging

Omega-3 DHA (Fish Oil)

Reviewed by the Nimbera editorial team · Last updated May 2026

Wei 2023 Am J Clin Nutr (PMID 37028557) - meta-analysis of 48 longitudinal studies (103,651 participants) found dietary DHA/EPA intake associated with ~20% lower risk of all-cause dementia; each 0.1 g/day increment of DHA linked to 8-9.9% lower risk of cognitive decline. Long-term supplement users (10+ years) showed 64% reduced Alzheimer's risk (HR 0.36). Evidence is observational; RCT results in established dementia have been less convincing.$20-$45/month for a quality 2,000 mg/day dose

How to use

Take 1,000-2,000 mg combined EPA+DHA daily with a meal containing fat. Look for products with at least 500 mg DHA per serving. Take consistently - benefits in observational studies were associated with long-term use.

How it works

DHA is the dominant structural fatty acid in neuronal membranes and synapses, comprising roughly 30-40% of brain lipids. It supports membrane fluidity, reduces neuroinflammation, decreases amyloid precursor protein processing, and promotes BDNF (brain-derived neurotrophic factor) expression. Adequate DHA may preserve hippocampal volume and synaptic density with aging.

Where to buy

Nordic Naturals Ultimate Omega, Carlson Labs Elite Omega-3, NOW Foods Ultra Omega-3, Life Extension Super Omega-3 - all available at pharmacies, health food stores, and Amazon. Look for third-party tested (IFOS or NSF certified) to ensure purity and accurate labeling.

Typical cost: $20-$45/month for a quality 2,000 mg/day dose

Safety notes

At doses above 3,000 mg/day, omega-3s can increase bleeding risk - use caution if taking warfarin, aspirin, or other anticoagulants and consult your prescriber. May lower blood pressure slightly; monitor if already on antihypertensives. Fish oil can cause fishy burps - take with food or choose enteric-coated formulas. Not a substitute for Alzheimer's treatment.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Wei 2023 - Am J Clin Nutr (PMID 37028557)

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.