Food, supplements and medicines are different
Omega-3 fatty acids include EPA, DHA and ALA. Oily fish, ordinary supplements and prescription omega-3 medicines are not interchangeable in concentration, evidence or regulatory status.
Evidence depends on the outcome
Benefits seen with one prescription formulation or population should not be transferred to every fish-oil supplement. Evidence for cardiovascular outcomes is mixed and depends on dose, formulation, baseline risk and concurrent care.
Safety and quality
Fishy taste and gastrointestinal effects are common practical issues. Higher intakes may affect bleeding or atrial-fibrillation risk in some settings. People using anticoagulants or preparing for procedures should discuss use with a clinician.
Useful information to track
- EPA and DHA per serving, not only total oil
- Product quality certification and expiry
- Other medicines, especially anticoagulants
- Reason for use and agreed review point
Sources
Reviewed against the following official guidance and primary evidence. Product information and clinical guidance can change.