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Omega-3 basics

EPA vs DHA: what's the difference, and which ratio should you buy?

Updated · Published · 6 min read · Sources linked below

Quick answer

EPA is mainly associated with inflammation signaling, triglycerides and mood; DHA is a structural fat concentrated in the brain and retina, most important in pregnancy and early childhood. For general health, the total EPA + DHA dose matters far more than the ratio. No ratio has been proven ideal. Choose DHA-heavy products for pregnancy and kids, and EPA-heavy ones if you're specifically interested in mood research. Most sugar gummies we track are 80–85% DHA, a profile typical of tuna oil.

Two different molecules

EPA (eicosapentaenoic acid, 20 carbons) and DHA (docosahexaenoic acid, 22 carbons) are long-chain omega-3 fatty acids found in fish, krill and algae. Both are built into cell membranes and turned into signaling molecules, but they accumulate in different places and have different research profiles.

EPADHA
Where it concentratesBlood cells, circulating lipidsBrain, retina, sperm
Strongest evidenceLowering triglycerides; EPA-only prescription drug in high-risk heart patientsFetal and infant brain and eye development
Mood researchMeta-analyses favor formulas with ≥60% EPADHA-dominant formulas show little effect on depression
Typical sourceAnchovy/sardine oil (~18% EPA : 12% DHA)Tuna oil, algal oil (DHA-rich)

Does the ratio matter?

Less than marketing suggests. The body interconverts some EPA and DHA, and most large heart trials used mixed EPA + DHA. The best-supported guidance is simple: get enough total EPA + DHA. The ratio becomes a tie-breaker in three cases:

  • Pregnancy and breastfeeding: guidelines specifically call for extra DHA (100–200 mg on top of the adult baseline).
  • Young children: DHA-dominant products are standard, e.g. Nordic Naturals Children's DHA (145 mg EPA / 355 mg DHA).
  • Mood: a 2019 meta-analysis found benefit mainly with formulas of ≥60% EPA at ≤1 g/day EPA. That's interesting research, not a treatment plan, so talk to your clinician.

Gummies by EPA:DHA split

  • EPA-leaning (57:43): Nordic Naturals Ultimate Omega Gummy Chews (600/450), NOW Gummy Chews and Life Extension Gummy Bites (300/225)
  • DHA-dominant (~70:30 DHA): Nordic Children's DHA (355/145)
  • Very DHA-dominant (~83% DHA): Nature Made, Amazon Basics, Nature's Bounty, Sundown, Coromega, Centrum, OLLY (all small doses, typically tuna oil)
  • DHA only (algae): NATURELO, Doctor's Best vegetarian gummies (33–50 mg)

Several gummies (vitafusion, L'il Critters, SmartyPants, Nordic's classic gummies) only list combined EPA + DHA, so you can't check the ratio.

Frequently asked

Is EPA or DHA better?

Neither is better overall. They have different roles. For general health, total EPA + DHA matters most. DHA is prioritized in pregnancy and early childhood; EPA has more research for triglycerides and mood.

What is the ideal EPA to DHA ratio?

No ratio has been proven ideal for general health. Natural anchovy/sardine oil is about 3:2 EPA:DHA, and most well-studied supplements are in that range. Choose DHA-rich products for pregnancy and kids.

Sources

  1. Omega-3 Fatty Acids — Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
  2. Efficacy of omega-3 PUFAs in depression: A meta-analysis — Translational Psychiatry (Liao et al.), 2019
  3. Scientific Opinion on Dietary Reference Values for fats (EPA + DHA adequate intake of 250 mg/day) — European Food Safety Authority (EFSA Journal), 2010
  4. Omega-3 Fatty Acids for the Management of Hypertriglyceridemia: A Science Advisory — American Heart Association — Circulation, 2019
  5. Dietary Supplement Label Database (DSLD) — NIH Office of Dietary Supplements

General information only, not medical advice. Talk to a qualified clinician about your own situation.