How Much DHA & EPA for Pregnancy? ACOG & WHO Guidelines (2025)

Prenatal nutrition advice can feel like a foreign language. Someone tells you to "take omega-3s." You open a supplement bottle. You see "fish oil 1,000 mg" and think, great, done. Except you have no idea how much of that is actually DHA versus EPA — the two distinct omega-3 fatty acids your body handles in completely different ways. And your prenatal gummy? It has DHA on the label, but only 50 mg, which may be nowhere near enough.

By the end of this guide, you will know exactly what ACOG, WHO and EFSA recommend in plain numbers, which foods deliver the goods, how your needs shift across the trimesters, and how to read a supplement label without a chemistry degree. You will also know when to skip the standalone supplement and when to talk to your clinician first.

What Are DHA and EPA — and Why Your Body Treats Them Differently

Let us start with the basics, because the two terms are used interchangeably in a lot of pregnancy content and that is genuinely unhelpful.

DHA (docosahexaenoic acid) is the dominant structural fat in the brain, the retina and the nervous system. During pregnancy, your fetus accumulates DHA at a rate of roughly 60–70 mg per day in the third trimester alone — that is a significant daily draw on your circulating DHA pool. If your diet is already low in omega-3s (as most Western diets are, by default), you may be depleting your own stores faster than you realise.

EPA (eicosapentaenoic acid) is more of a metabolic workhorse. Your body converts EPA into anti-inflammatory compounds called resolvins and protectins. Research published in the British Journal of Nutrition and Obstetrics & Gynecology has linked adequate EPA intake to a reduced risk of early pre-term birth and lower rates of gestational hypertension. EPA does not accumulate in fetal tissues the way DHA does, but it supports the inflammatory balance your placenta needs to function well.

Most people in Western countries are already borderline deficient in both, because our dietary patterns favour omega-6 fats (in seed oils, processed snacks, fast food) over omega-3s. Pregnancy is not the time to hope for the best — knowing the numbers matters.

ACOG, WHO and EFSA: What the Official Bodies Actually Recommend

This is where things get surprisingly consistent across global guidelines, which is reassuring.

The American College of Obstetricians and Gynecologists (ACOG) recommends a minimum of 200 mg DHA per day during pregnancy. The World Health Organization (WHO) echoes this, advising 200 mg DHA plus an additional unspecified amount of EPA from whole foods or supplements. The European Food Safety Authority (EFSA) sets a combined DHA + EPA target of 200–250 mg per day, again anchored to that 200 mg DHA floor.

No major global body specifies a strict EPA dose separate from DHA — the 200 mg DHA figure is the consensus anchor. EPA intake is generally advised to be similar to or somewhat lower than DHA. Some Scandinavian authorities suggest a 1:1 ratio as a target, but that is not universal guidance.

One nuance worth noting: the 200 mg floor is a minimum based on developmental outcomes. Research does not show harm at higher dietary intakes from whole foods. High-dose purified supplements (above 3,000 mg combined EPA+DHA) are a different conversation — and one you should have with your clinician.

Food Sources: Getting DHA and EPA From What You Eat

If you eat fish regularly, you may not need a standalone supplement at all. Fatty fish is the most efficient whole-food source of both DHA and EPA combined.

Good choices (1–2 servings per week):

Salmon (Atlantic or sockeye) — roughly 1,200–1,800 mg DHA + EPA per 100 g
Sardines — approximately 1,000–1,500 mg per 100 g
Herring — around 1,700 mg per 100 g
Rainbow trout — roughly 900–1,200 mg per 100 g

Two servings of salmon per week would comfortably exceed the 200 mg DHA minimum, with plenty of EPA as a bonus.

Fish to limit or avoid during pregnancy: King mackerel, swordfish, tilefish and shark carry higher mercury loads that cross the placenta and accumulate in fetal tissue. The FDA and EPA joint advisory is clear on this. Canned light tuna is generally considered safe in moderation (no more than 2–3 cans per week), but albacore tuna is higher in mercury.

Plant-based and vegetarian sources: Walnuts, chia seeds and flaxseed contain ALA (alpha-linolenic acid), a precursor that your body converts — inefficiently — into DHA and EPA. Conversion rates hover around 5–10%, which means these foods alone are unlikely to meet pregnancy targets. Algae oil, however, is a direct source of DHA and EPA that bypasses conversion entirely. Some formulations offer a near 1:1 DHA:EPA ratio, similar to what you would get from fish.

If you do not eat fish and you want to skip the supplement aisle entirely, our complete guide to choosing a prenatal supplement covers how to evaluate algae-based options with confidence.

Trimester-by-Trimester: How Your Needs Shift

DHA is not just a third-trimester concern. Here is a rough timeline of what the science says about priority windows.

First trimester: DHA supports early neural tube formation and placental development. Placental DHA transport begins early — your body preferentially shunts DHA across the placenta from the start. If you are planning pregnancy, establishing good DHA stores before conception gives your placenta the best possible foundation.

Second trimester: Brain development accelerates, the retina forms, and your baby's sensory systems come online. DHA deposition in neural tissue ramps up significantly. This is where many people notice a gap between what their prenatal delivers and what the science suggests they need.

Third trimester: This is the peak accumulation period. Your baby is building roughly 70 mg of DHA into neural tissue every single day. If your own diet is low in omega-3s, you may experience what researchers call "maternal DHA depletion" — which is associated with postpartum low mood in several observational studies. Worth noting without being alarmist.

Breastfeeding: ACOG and La Leche League both continue the 200 mg DHA recommendation through lactation. Breast milk DHA content reflects your dietary intake, so what you consume directly shapes what your baby receives.

Picking a Supplement: What to Look For

Most prenatal vitamins are insufficient as a sole omega-3 source. Let me be direct: if your prenatal contains 50–200 mg of DHA, it is better than nothing, but it may not meet the 200 mg floor recommended by ACOG. Many prenatals are formulated to the old standard, before global guidelines updated.

Look for the following when evaluating a standalone omega-3 supplement:

DHA content: At minimum 200 mg per capsule. Do not be distracted by the "total fish oil" number — that includes EPA, other fats and the carrier oil. Read the DHA line specifically.
Triglyceride form: This is the form found naturally in fish. It is better absorbed than the ethyl ester form used by some cheaper manufacturers. If the label does not specify, it is probably ethyl ester.
Third-party testing: Look for USP, NSF or IFOS certification, which confirms the product has been tested for heavy metals, dioxins and PCBs. This matters especially during pregnancy.
Algae oil for plant-based needs: Several brands now offer algae-derived DHA and EPA with independent third-party testing. No fishy aftertaste, no ocean-borne contaminants, and in some studies, better bioavailability than ethyl ester fish oils.
No retinol vitamin A: Some omega-3 supplements combine with vitamin A in retinol form, which is teratogenic at high doses. Avoid combination products unless you have verified the vitamin A is in beta-carotene form.

Safety First: Interactions, Dosage Caps and Who Should Be Cautious

Omega-3 supplements are well-tolerated by most people. Side effects are usually limited to mild fishy aftertaste, digestive upset or, occasionally, fish burps (which are as unpleasant as they sound — freezing the capsules before taking them can help).

One group that needs to be careful: people taking anticoagulant or antiplatelet medications such as warfarin, heparin or aspirin. High-dose omega-3s (above 3,000 mg combined EPA+DHA per day) can theoretically amplify the blood-thinning effect and increase bleeding risk. Most pregnancy-safe supplement doses are far below this, but always disclose supplement use to your clinician.

If you have a fish or shellfish allergy, algae oil is your safest route — it is the original source of marine omega-3s and contains no fish proteins.

Quality matters more than brand prestige. The supplement industry is poorly regulated in most countries. A product with IFOS (International Fish Oil Standards) certification or USP verification has been independently tested for the things that actually matter during pregnancy: heavy metals, oxidation and contaminant levels.

FAQ

Final thoughts

Omega-3 nutrition during pregnancy is one of the areas where the science is genuinely clear: at least 200 mg DHA per day is the evidence-backed floor, and most people — especially those not eating fatty fish twice a week — are falling short of it. Check your prenatal label. If it does not specify at least 200 mg DHA, consider adding a targeted supplement or rethinking your food strategy. Algae oil is a legitimate, well-researched alternative for anyone who does not eat fish.

If you are unsure where to start, our complete guide to choosing a prenatal supplement walks through the label-reading process step by step.

How Much DHA and EPA for Pregnancy? What the Science Actually Says