September 22, 2026 
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William "Wes" Alden, MD, PhD | Clinical Education Series
Omega-3 Fatty Acids in Everyday Practice
By William “Wes” Alden, MD, PhD
Omega-3 fats sit in an unusual spot. They are essential nutrients, common dietary components, and, in purified form, FDA-approved drugs. Keeping those categories straight prevents both under-use and over-promising.
Prescription products
Icosapent ethyl is pure EPA. It is approved for very high triglycerides and, after the REDUCE-IT trial, for lowering cardiovascular events in high-risk patients already on statins. The combination of EPA and DHA ethyl esters is approved as an add-on for severe hypertriglyceridemia. These products have standardized doses and outcome data that ordinary fish-oil capsules do not match.
Fish-oil and algal supplements
Over-the-counter oils vary in dose, freshness, and EPA-to-DHA ratio. They can raise the omega-3 index and lower triglycerides at higher intakes, but the cardiovascular outcome trials have been mixed. Rancid oil helps no one. Quality testing matters.
DHA and the brain
DHA is a major building block of neuronal membranes. Higher blood levels track with better cognitive scores in some observational studies. Trials in people who already have dementia have mostly been disappointing. The more realistic window may be earlier, when vascular and metabolic risks are still being shaped. DHA is not an approved treatment for Alzheimer’s disease.
How to use them in clinic
For triglycerides at or above 500 mg/dL, prescription omega-3s are a guideline-supported option. For patients who meet the REDUCE-IT profile, icosapent ethyl has outcome evidence. For general “brain health,” the emphasis belongs on overall diet pattern and ordinary vascular risk control. Checking an omega-3 index can help fine-tune dosing in selected cases, but it is not required for everyone.
Related fats
Medium-chain triglycerides supply quick ketogenic fuel and appear in some metabolic protocols. Odd-chain saturated fats such as C15:0 are under study for membrane and metabolic effects. Both remain supplements or dietary components, not approved drugs for cognitive or aging indications.
Practical view
Match the form and the dose to the actual goal. Do not assume a grocery-store fish-oil capsule will deliver the same results shown for high-dose purified EPA in a high-risk cardiovascular trial.
William “Wes” Alden, MD, PhD, is a physician-scientist and internist. His career has included academic medicine, federal clinical research, community practice, and medical philanthropy. He works in the Greater New Orleans area, including Metairie, New Orleans, and the Northshore communities of Mandeville and Covington. His interests include metabolic health, integrative approaches, neurodegenerative conditions, and practical whole-person care. He emphasizes honest evidence and clear communication with patients and families.
This article is for general education and reflects Dr. Alden’s professional perspective. It is not medical advice and does not create a doctor-patient relationship. Results vary from person to person. Many peptides, NAD products, and specialty lipids mentioned here are not FDA-approved for anti-aging, cognitive enhancement, or most of the wellness uses sometimes promoted. Material labeled for research use only should never be given to people. Please consult a qualified clinician about your own situation before starting any evaluation or treatment.
