EPA vs DHA: What EPA and DHA Are, and Which Omega-3 You Need
Prices checked · 10 fish oil and algae oil products · 6 registries searched
EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are the two long-chain omega-3 fats in fish oil and algae oil. Every fish oil we price has more EPA than DHA. The algae oils that list both have more DHA. No ratio has been shown to be better for general use, so compare products by EPA+DHA per serving and cost.
EPA-heavy picks: Sports Research Triple Strength Omega-3 (2.7:1, 690 mg EPA in 1 softgel); Viva Naturals Triple Strength Omega-3 (2.6:1, 1,500 mg EPA in 2 softgels); NOW Foods Ultra Omega-3 (2:1, 500 mg EPA in 1 softgel).
DHA-heavy picks: Nordic Naturals Algae Omega (1:2, 390 mg DHA in 2 softgels); Garden of Life Minami Algae Omega-3 (500 mg DHA in 2 softgels; EPA not listed).
As an Amazon Associate we earn from qualifying purchases. Picks are sorted by the EPA:DHA ratio on the label, never commissions. Not medical advice; talk to a clinician before starting a supplement, especially at high doses.
EPA and DHA in every omega-3 we price
| Product | EPA per serving | DHA per serving | EPA:DHA | Total omega-3 on label | Per 1,000 mg EPA+DHA (checked Oct 5, 2026) | Registry check | |
|---|---|---|---|---|---|---|---|
| NOW Foods Ultra Omega-3 1 softgel per serving | 500 mg | 250 mg | 2:1 | — | $0.21 | Not found in IFOS or the other registries we searched | Check price → |
| Viva Naturals Triple Strength Omega-3 2 softgels per serving | 1,500 mg | 570 mg | 2.6:1 | — | $0.30 | IFOS Nutrasource listing VIVN0008 | Check price → |
| Sports Research Triple Strength Omega-3 1 softgel per serving | 690 mg | 260 mg | 2.7:1 | — | $0.35 | IFOS Nutrasource listing SPRT0048 | Check price → |
| Carlson Elite Omega-3 Gems 2 softgels per serving | 800 mg | 600 mg | 1.3:1 | 1,600 mg | $0.47 | IFOS Nutrasource listing CRLL0014 | Check price → |
| Nordic Naturals Ultimate Omega 2 softgels per serving | 650 mg | 450 mg | 1.4:1 | 1,280 mg | $0.65 | Not in IFOS (Nutrasource lists it for non-GMO testing only); not found in the other registries we searched | Check price → |
| Sports Research Vegan Omega-3 1 softgel per serving | Not split 630 mg EPA+DHA | Not split | Not listed | — | $0.71 | Vegan Certified, Non-GMO Tested (not a lab-testing program) | Check price → |
| DEVA Vegan Omega-3 DHA-EPA 1 softgel per serving | Not split 500 mg EPA+DHA | Not split | Not listed | — | $0.99 | None stated | Check price → |
| Nordic Naturals Algae Omega 2 softgels per serving | 195 mg | 390 mg | 1:2 | 715 mg | $1.62 | Not in IFOS (Nutrasource lists it for non-GMO testing only); not found in the other registries we searched | Check price → |
| Future Kind Vegan Omega-3 1 softgel per serving | Not split 275 mg EPA+DHA | Not split | Not listed | — | $1.82 | None stated | Check price → |
| Garden of Life Minami Algae Omega-3 2 softgels per serving | Not listed | 500 mg | DHA only listed | — | $2.29 DHA only | None stated | Check price → |
How we compute it: per 1,000 mg EPA+DHA = Amazon price ÷ (servings in the bottle × mg of EPA+DHA per serving) × 1,000. EPA and DHA are the amounts printed on each brand’s label. Sports Research Vegan Omega-3, DEVA Vegan Omega-3 DHA-EPA and Future Kind Vegan Omega-3 list only a combined EPA+DHA amount, so there is no ratio to show. “Total omega-3 on label” is filled in only where we have confirmed it from the label; a dash means we have not. We searched NSF Certified for Sport (full list read October 1, 2026), NSF/ANSI 173 (list saved August 25, 2026), Informed Choice (list read September 22, 2026), Informed Sport and USP Verified. NSF lists each product by flavor and pack, so we count an NSF listing only when it covers the product we link. We also checked IFOS, the fish oil testing program run by Nutrasource, product by product on September 29, 2026.
The short version: both are omega-3 fats, and most products contain both. EPA is more of a signaling molecule; DHA is a structural building block of cell membranes. For general use, a product with both is fine. Read the EPA and DHA lines on the label to see the ratio. Below: how the two differ, how to read a label, and where the popular memory claims fall short.
What Is the Difference Between EPA and DHA?
DHA builds; EPA signals. DHA is a physical component of cell membranes — it's concentrated in the retina and brain gray matter, where it keeps membranes fluid and functional. EPA is barely present in those tissues; instead it competes with the omega-6 arachidonic acid at the enzymes that make inflammatory signals, nudging the balance toward less inflammation. Both are also raw material for specialized pro-resolving mediators (resolvins and protectins) that help actively switch off inflammation (Serhan 2014, PMID: 24899309) — real biochemistry, though that's a mechanism, not proof a supplement treats any specific disease.
One nuance the label won't tell you: your body converts the plant omega-3 (ALA, from flax and chia) into EPA and DHA very inefficiently — a few percent at best — so pre-formed EPA/DHA from fish or algae is the practical way to raise your levels. And while DHA can spare some EPA (taking DHA slows how fast you burn through EPA), a careful isotope study found DHA is not meaningfully converted backward into new EPA (Metherel 2019, PMID: 31204771).
EPA vs DHA: Head to Head
| Factor | EPA | DHA |
|---|---|---|
| Primary role | Signaling / anti-inflammatory precursor | Structural membrane component |
| Where it concentrates | Blood, immune & endothelial cells | Brain gray matter, retina |
| Typical amount in fish oil | Often the larger share | Often the smaller share (algal oil is often DHA-forward) |
| Cognition in healthy adults | No benefit in a Cochrane review (PMID 22696350) | |
How Do the Ratios Differ Between Products?
Most standard fish oils run from about 1:1 to 2:1 EPA:DHA. Some concentrates are EPA-forward, and algal oils are often DHA-forward. There is no proven best ratio for general use, so a balanced product is a reasonable default. Talk to your doctor if you are thinking about a high amount of either one.
Where the marketing outruns the evidence. The leap from "DHA builds the brain and eyes" to "a DHA supplement will sharpen your thinking" is not supported by the best trials in already-healthy adults. A Cochrane review found omega-3 supplements did not improve cognition in cognitively healthy older adults (PMID: 22696350).
How to Read EPA and DHA on the Label
Whatever ratio you want, read the actual EPA and DHA numbers — not the "fish oil" total. A typical label:
- Fish Oil: 1,200 mg — total oil weight, mostly irrelevant.
- EPA: 360 mg + DHA: 240 mg = 600 mg EPA+DHA — this is what actually counts, and it tells you the ratio (here, 1.5:1).
To reach 1,000 mg EPA+DHA with that product you'd need about two softgels. Always add EPA and DHA yourself, and make sure the form is triglyceride, not ethyl ester.
Prices, EPA and DHA for every product we price are in the table at the top of this page. See the fish-oil forms comparison for triglyceride vs ethyl ester, and the full buying guide for ranked picks.
A Note on Safety
High-dose omega-3 has two real cautions. Above about 3 g/day, fish oil has a mild blood-thinning effect — if you take an anticoagulant or antiplatelet medication, have a bleeding disorder, or have surgery coming up, talk to your doctor first. Separately, high-dose omega-3 (≥3-4 g/day) was linked to a higher rate of atrial fibrillation in the REDUCE-IT and STRENGTH trials (PMID: 30415628, PMID: 33190147), so anyone with a history of AFib or arrhythmia should check with a doctor before high-dose use.
Frequently Asked Questions
What is the difference between EPA and DHA?
DHA is structural — a building block of brain and retinal membranes. EPA is more of a signaling molecule. Most fish oil has both; the ratio varies from product to product.
Should I take more EPA or DHA?
There is no proven best ratio for general use, so a balanced combined product is a reasonable choice. Talk to your doctor if you are thinking about a high amount of either.
Does DHA make you smarter or improve memory?
Not in healthy adults — a Cochrane review found no cognitive benefit over placebo. DHA is structurally important in the body, but it is not a memory booster.
Which EPA:DHA ratio is best?
There is no single magic ratio. Products range from EPA-forward, to balanced, to DHA-forward (such as algal oil). Read the EPA and DHA lines on the label to see what you are getting.
Which omega-3 supplements have the most EPA compared with DHA?
By label, the most EPA-heavy products we price are Sports Research Triple Strength Omega-3 (2.7:1 EPA:DHA), Viva Naturals Triple Strength Omega-3 (2.6:1 EPA:DHA), NOW Foods Ultra Omega-3 (2:1 EPA:DHA). The DHA-heavy ones are Nordic Naturals Algae Omega (1:2 EPA:DHA) and Garden of Life Minami Algae Omega-3 (DHA only listed). Prices and amounts are in the table on this page; prices were recorded on October 5, 2026.
Related Guides
- Triglyceride vs Ethyl Ester — the form that decides absorption
- Best Omega-3 Supplement — the full ranked buying guide
- All Omega-3 Guides
Sources
- Metherel AH, et al. "Compound-specific isotope analysis reveals no retroconversion of DHA to EPA but substantial conversion of EPA to DHA following supplementation." Am J Clin Nutr. 2019;110(4):823-831. PMID: 31204771
- Sydenham E, et al. "Omega 3 fatty acid for the prevention of cognitive decline and dementia." Cochrane Database Syst Rev. 2012;(6):CD005379. PMID: 22696350
- Serhan CN. "Pro-resolving lipid mediators are leads for resolution physiology." Nature. 2014;510(7503):92-101. PMID: 24899309
- Bhatt DL, et al. "Cardiovascular Risk Reduction with Icosapent Ethyl for Hypertriglyceridemia (REDUCE-IT)." N Engl J Med. 2019;380(1):11-22. PMID: 30415628
- Nicholls SJ, et al. "Effect of High-Dose Omega-3 Fatty Acids vs Corn Oil on Major Adverse Cardiovascular Events (STRENGTH)." JAMA. 2020;324(22):2268-2280. PMID: 33190147
- NIH Office of Dietary Supplements. "Omega-3 Fatty Acids: Fact Sheet for Health Professionals." ods.od.nih.gov