ALA
The plant-based omega-3
Found in flaxseed, chia seeds, walnuts and some vegetable oils. Humans can convert small amounts to EPA and DHA, but conversion is limited.
Ingredient study 01 / Fatty acids
Omega-3.
Beyond the
headlines.
EPA. DHA. ALA. Learn what separates them, what evidence can tell us, and the questions that deserve an answer before you buy.
AMARANTE / VISUAL EXPLAINER
Science in
50 seconds.
A short caption-led film, made to introduce the subject—not to sell you a product.
Approx. 52 seconds · HD · Silent, with on-screen text
Read the video transcript
ALA comes mainly from plants; EPA and DHA are found in fish and algae. They have distinct roles in human physiology. Always compare the EPA and DHA amounts with total fish oil on a product label. Eating oily fish twice weekly is part of a commonly recommended dietary pattern. Prescription omega-3 medicines differ from standard supplements. Consider diet, safety, medications and Canadian authorization before buying.
01 / The essentials
Three names.
Different biology.
EPA
A marine omega-3
Found in oily fish and marine algae. EPA participates in cell signalling and other physiological pathways. Study outcomes vary by population and dose.
DHA
A structural omega-3
Found in fish and algae. DHA is an important part of cell membranes, including membranes in the brain and retina; that does not make every supplement claim proven.
02 / What research tells us
Food and supplements are not interchangeable.
Dietary patterns that include fish and seafood are consistently associated with cardiovascular health. The American Heart Association recommends eating fish, particularly oily fish, twice a week.
Prescription omega-3 medicines can lower very high triglycerides. Nonprescription fish-oil supplements differ in formulation, dose and evidence. Supplementation is not a proven way for everyone to prevent a heart attack.
Evidence matters by outcome. We assess claims separately: dietary habits, laboratory markers, prescription treatment and long-term clinical events answer different questions.
FROM MOLECULE TO MEMBRANE
Biological mechanisms help explain plausibility. Human trials are needed to establish clinical benefits.
03 / Read beyond the headline
1,000 mg fish oil ≠ 1,000 mg EPA + DHA.
A label is a source of facts, not evidence of a clinical benefit. Try the example labels below.
Illustrative examples only · not actual products
Standard fish oil
Fish oil per serving1,000 mg
EPA per serving180 mg
DHA per serving120 mg
300 mg EPA + DHA (30% of total oil)
This is an example only. The rest of the fish oil contains other fatty acids or components. Actual product concentrations differ.
ALA is also an omega-3, but it is not counted as EPA or DHA. Neither the example ratios nor the total fish-oil amount establish an appropriate dose for you.
05 / Decision-making, not selling
Before you buy, ask better questions.
Could food meet your needs?
Consider regular fish consumption, alternatives such as algae, dietary preferences and whether there is a reason to supplement.
Does it fit your circumstances?
Higher doses can have side effects or interactions. Discuss use with a clinician if you take anticoagulants or have cardiovascular concerns.
Look for authorization.
For natural health products sold in Canada, check the NPN and its approved indication in Health Canada’s database.
Sources and further reading
NIH · Omega-3 fact sheet ↗AHA · Fish and omega-3 ↗NCCIH · Supplements ↗Health Canada · NPN database ↗
General education only. Illustrations simplify biology and are not to scale. The page is an editorial concept requiring qualified medical/scientific review before publishing as health guidance.
THE NUTRITION CONNECTION
See the bigger picture.
How does this nutrient connect with everyday habits, dietary variety and healthy ageing? Explore our evidence-first Blue Zones guide—without assuming supplements are a shortcut to longer life.