Learn how to read EPA and DHA amounts, distinguish supplements from prescription omega-3, and understand why there is no single dose for every health goal.
Fish oil weight is not EPA plus DHA
Start with the facts panel, not the number on the front of the bottle. Find EPA, DHA and the serving size. Add EPA and DHA per serving, then check how many capsules that serving contains. Total fish oil can include other fats; two bottles with the same oil weight may deliver different EPA and DHA amounts. NIH
There is no universal dose for every adult
US dietary reference intakes for adults establish an adequate intake for ALA, but not a separate recommended daily allowance for EPA and DHA. This does not mean EPA and DHA are unimportant; it means a single official US daily requirement cannot be quoted for everyone. Diet, reason for use and medical history affect the decision. NIH
Do not turn doses from studies of depression, arthritis or cardiovascular disease into general self-treatment instructions. A result for a particular formulation and patient group may not apply to another supplement or a healthy reader.
Prescription treatment is a separate decision
Prescription omega-3 products are used for specific indications, including high triglycerides. They are not interchangeable with an arbitrary number of store-bought fish-oil capsules. NIH describes trials using 4 g per day in people with cardiovascular disease or high cardiovascular risk that found a higher incidence of atrial fibrillation. That figure describes a study regimen, not a suggested dose. NIH
Discuss use with the prescribing clinician if you take anticoagulants or have a history of heart-rhythm problems. There is no single threshold below which every person and drug combination is automatically safe.
Record the product accurately
Keep the product name, EPA and DHA per serving, capsules per serving and the amount you actually take. Follow product instructions and any individualized advice; do not change a prescription based on this article. A supplement log can prevent confusion between capsules and milligrams. It cannot verify ingredient purity or establish a treatment benefit.
