Nutrition & Supplements
How Much DHA Should You Take During Pregnancy?
ACOG recommends 200–300 mg of DHA per day, but the NIH now endorses at least 250 mg combined DHA+EPA — and most American pregnant women get only 60 mg a day from food. Here is how to close the gap with algae oil or fish oil, and why starting early matters.
Clinically reviewed · June 2026
ACOG recommends 200–300 mg of DHA per day during pregnancy; the NIH now endorses at least 250 mg of combined DHA+EPA daily. Most American pregnant women get only about 60 mg from food. A prenatal with built-in DHA or a separate algae- or fish-oil supplement started before or early in pregnancy is the most reliable way to close that gap.
Docosahexaenoic acid — DHA — is the omega-3 fatty acid that your baby's brain and retina are literally built from. It accumulates in fetal neural tissue from the earliest weeks of brain development, but the demand becomes especially acute in the third trimester: between weeks 35 and 40, fetal DHA accumulation increases by as much as 840%, simultaneously drawing down maternal stores. If your DHA status is low going into the third trimester, there is no quick way to catch up.
That is why the question of how much DHA to take during pregnancy is not really a third-trimester question. It is a preconception question — and a first-trimester question — and it is one that standard prenatal vitamin labels often answer incompletely, or not at all.
What Do ACOG and the NIH Actually Recommend for DHA?
ACOG recommends 200–300 mg of DHA per day during pregnancy, alongside 8–12 ounces of low-mercury seafood per week as the dietary foundation. For years, that was the primary institutional benchmark.
In 2024, the National Institutes of Health updated its Office of Dietary Supplements pregnancy fact sheet and endorsed supplementation for the first time, recommending at least 250 mg of combined DHA+EPA daily, with an additional 100–200 mg of DHA specifically for pregnancy. That update matters: it reflects a growing evidence base showing that the combined anti-inflammatory effect of DHA and EPA together — not DHA in isolation — drives much of the pregnancy benefit, particularly for reducing preterm birth risk.
The NIH fact sheet also reported something striking: mean dietary DHA intake among pregnant American women is approximately 60 mg per day. That is less than a third of the ACOG minimum, and less than a quarter of what emerging evidence supports as optimal. The gap is not marginal — it is the difference between a nutrient that is merely present and one that is doing its job.
Also notable: a 2024 Clinical Practice Guideline from the Council for Responsible Nutrition found that intakes up to 1,000 mg per day of DHA or DHA+EPA carry no safety concerns during pregnancy. There is meaningful clinical headroom above the ACOG minimum for women who want to match the doses used in preterm birth prevention research.
ACOG: 200–300 mg DHA/day · NIH (2024): ≥250 mg DHA+EPA/day, plus an additional 100–200 mg DHA · CRN Clinical Practice Guideline: up to 1,000 mg DHA or DHA+EPA/day is safe · Average U.S. pregnant women's dietary intake: ~60 mg/day.
Algae Oil vs. Fish Oil: Which Source Is Better for Pregnancy?
Both algae oil and fish oil deliver DHA with clinically equivalent bioavailability — the debate between them is not about absorption. It is about source, EPA content, and sustainability.
Fish oil (typically from anchovies, sardines, and other small pelagic species) provides both DHA and EPA, usually in a 2:1 to 1:1 ratio. It delivers higher concentrations per softgel than most algal products, and it carries the longest research track record for pregnancy outcomes. The legitimate historical concern about mercury and PCBs in fish oil has been addressed by modern purification: molecularly distilled, triglyceride-form fish oil from quality manufacturers poses no measurable mercury exposure risk. Look for products that publish third-party oxidation testing — rancid fish oil is a real quality issue, and oxidized omega-3s provide reduced benefit.
Algae oil is where fish get their DHA in the first place: marine fish accumulate omega-3s by eating microalgae. Supplementing with purified algal DHA cuts out the fish entirely. It is fully vegan, carries zero mercury risk by construction, and is highly sustainable. The limitation is EPA: concentrating meaningful EPA from algae is commercially difficult, and most algal products are DHA-dominant with only trace EPA. For women whose primary goal is meeting the ACOG DHA minimum, algal oil works. For women targeting the higher combined DHA+EPA doses associated with preterm birth risk reduction in clinical trials, fish oil may deliver a more complete profile per capsule.
| Product | Source | DHA per serving | EPA per serving | Vegan | Approx. cost/month |
|---|---|---|---|---|---|
| Nordic Naturals Prenatal DHA | Fish (anchovy/sardine) | 480 mg | 205 mg | No | ~$25–30 |
| Needed Prenatal Omega-3 | Fish (sustainable) | 500 mg | 500 mg | No (plant-based shell) | ~$27–30 |
| Ritual Essential Prenatal (built-in) | Algae (Schizochytrium sp.) | 350 mg | ~0 | Yes | Included in $39/mo prenatal |
| Ritual Omega-3 DHA & EPA (standalone) | Algae | 308 mg | 154 mg | Yes | ~$30/mo add-on |
Source: product pages and third-party reviews as of mid-2026. Prices reflect subscription rates; one-time purchase prices are higher. This table is for comparison only and does not constitute an endorsement.
Why First-Trimester DHA Status Matters — Not Just the Third-Trimester Surge
The third trimester is when fetal DHA demand becomes dramatic — and when the research showing lower preterm birth risk is concentrated. But the biology of DHA in pregnancy starts much earlier.
DHA is incorporated into fetal brain cell membranes from the earliest stages of neural development. The neural tube begins forming in weeks 3 and 4, before most women even know they are pregnant. Early fetal brain architecture depends on the availability of DHA in maternal circulation, and maternal DHA stores — built up over months of dietary intake and supplementation — are the reservoir the placenta draws from. A mother entering the third trimester with depleted DHA stores cannot rapidly replenish them to match the fetal demand surge.
The NIH's 2024 updated guidance explicitly addresses this: supplementation is most beneficial when started before conception or in early pregnancy. A 2023 meta-analysis published in the American Journal of Obstetrics & Gynecology MFM found that omega-3 supplementation in pregnancy reduced preterm birth risk by approximately 11% and early preterm birth by approximately 42% — effects that require adequate tissue levels to be established, not a last-minute dose in week 34.
First-trimester nausea is the practical complication. Many women struggle to swallow fish-oil softgels during the first trimester, and the fishy burp associated with some products can be genuinely intolerable. Strategies that help: refrigerating fish-oil capsules (reduces oxidation and odor), choosing algae-oil capsules (no fishy taste by construction), taking the supplement with a meal, or selecting enteric-coated products. If the only format you can tolerate in the first trimester is the DHA already embedded in your prenatal multivitamin, that is a reasonable starting point — any consistent DHA intake beats none.
How to Know If Your Prenatal Already Covers Your DHA Needs
Check the Supplement Facts panel on your prenatal vitamin. Many well-known brands — including Thorne Basic Prenatal and FullWell Prenatal Multivitamin — include no DHA at all, by design: they are multivitamins only, and their manufacturers expect you to add a separate omega-3. Ritual Essential Prenatal is the primary exception in the multivitamin category, embedding 350 mg DHA from algae within the 2-capsule daily formula — enough to meet the ACOG minimum without any add-on.
A 2024 evaluation of 68 U.S. prenatal supplements found the mean DHA content was 368 mg among products that included it — but roughly half of prenatals on the market contain no DHA whatsoever. If your prenatal does not list DHA on the label, you need either a separate omega-3 supplement or consistent fatty fish consumption (2–3 servings of salmon, sardines, or trout per week) to reach the recommended range.
Third-party certification matters when choosing an omega-3 supplement you will take every day through all three trimesters. Look for products with NSF certification, USP verification, or Clean Label Project certification — the last of which explicitly screens for pesticide residues and heavy metals in addition to label accuracy. Nordic Naturals publishes third-party oxidation testing and COAs on request. Needed carries Friend of the Sea sustainability certification for its fish oil.
This article is general health information, not medical advice. DHA needs can vary based on your diet, underlying health, and individual pregnancy circumstances. Discuss your omega-3 supplement plan with your OB-GYN, certified nurse-midwife, or registered dietitian before making changes.
Frequently asked
How much DHA do you need per day during pregnancy?
ACOG recommends 200–300 mg of DHA per day during pregnancy, and advises consuming 8–12 ounces of low-mercury seafood per week as the preferred dietary source. The NIH updated its guidance in 2024 to explicitly endorse supplementation for the first time, recommending at least 250 mg of combined DHA+EPA daily, with an additional 100–200 mg of DHA specifically for pregnancy. A 2024 Clinical Practice Guideline found that intakes up to 1,000 mg of DHA or DHA+EPA per day carry no safety concerns during pregnancy. The practical problem: the average dietary DHA intake among pregnant American women is approximately 60 mg per day — well below every benchmark — making supplementation not optional for most. Talk to your provider about your baseline intake and whether a standalone omega-3 makes sense for your prenatal routine.
Is algae oil as good as fish oil for DHA during pregnancy?
Yes — algae oil and fish oil deliver DHA with clinically equivalent bioavailability. Algae is the original source: marine fish accumulate their omega-3s by eating microalgae, so supplementing with algal oil simply removes the fish intermediary. Purified algal DHA is fully vegan and carries zero mercury exposure risk by construction, making it the preferred choice for vegetarians, vegans, and anyone concerned about fish-derived contaminants. The key limitation of most algal products is EPA: concentrating meaningful EPA from algae is commercially difficult, so most algal products are DHA-dominant with minimal EPA. Fish oil from anchovies and sardines provides higher combined DHA+EPA per softgel and carries the longer research track record. Purified, triglyceride-form fish oil from quality manufacturers poses no measurable mercury risk. Both are acceptable; your diet and values determine which is right for you.
When should you start taking DHA during pregnancy?
Ideally, before conception. The NIH's updated 2024 guidance explicitly states that DHA supplementation is most beneficial when started before or in early pregnancy — not just in the third trimester when fetal brain growth accelerates. DHA supports fetal neural tube closure and early brain architecture from the very first weeks of organogenesis. The American Pregnancy Association notes that DHA accumulation in fetal brain and retinal tissue is continuous, not concentrated solely in late pregnancy. While the third-trimester surge in fetal DHA accumulation — up to 840% between weeks 35 and 40 — is dramatic, maternal DHA stores need to be built up well in advance. Women with depleted stores cannot compensate quickly. Starting a prenatal that includes DHA or adding a standalone supplement as soon as pregnancy is confirmed, or before trying to conceive, gives the best overall coverage across all three trimesters.
What is the difference between DHA and EPA in prenatal supplements?
DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid) are both long-chain omega-3 fatty acids, but they serve different primary roles. DHA is the structural omega-3 — it concentrates in brain cell membranes and retinal photoreceptors, and it is the fatty acid most directly tied to fetal brain and eye development. EPA is the signaling omega-3 — it modulates inflammation and supports vascular health, and is associated in clinical research with reduced preterm birth risk. A 2023 meta-analysis in the American Journal of Obstetrics & Gynecology MFM found omega-3 supplementation reduced preterm birth risk by approximately 11% and early preterm birth by approximately 42%, with the benefit attributable to combined DHA+EPA intake. Prenatal guidelines reference DHA specifically for brain development, but the combined DHA+EPA target reflects the additive anti-inflammatory benefit of both fatty acids together. Most fish-oil prenatals provide both; most algal-oil products are predominantly DHA with little EPA.
Can you get enough DHA from food alone during pregnancy?
For most American pregnant women, diet alone is not sufficient. The NIH's 2024 pregnancy fact sheet reports that mean dietary DHA intake among pregnant women in the United States is approximately 60 mg per day — less than one-third of the ACOG minimum of 200 mg. The richest dietary sources of DHA are fatty fish: a 3-ounce serving of wild salmon provides roughly 1,000–1,500 mg of DHA, while canned light tuna provides around 150–200 mg per serving. ACOG and the FDA recommend 8–12 ounces of low-mercury seafood per week during pregnancy, which can cover DHA needs for women who eat fish regularly. The NIH fact sheet explicitly endorses supplementation for women who do not regularly consume fatty fish. Vegetarian and vegan women who eat no seafood are especially reliant on algal DHA supplements to meet pregnancy recommendations. This article does not replace advice from your healthcare provider — always confirm your supplement plan with your OB, midwife, or dietitian.
Which prenatal supplement brands provide the most DHA?
DHA content varies widely across prenatal vitamins, and many provide none at all. Among widely available brands: Nordic Naturals Prenatal DHA (fish oil) delivers 480 mg DHA and 205 mg EPA per softgel — among the highest DHA doses in a prenatal-specific product. Needed Prenatal Omega-3 provides 500 mg DHA and 500 mg EPA per two-softgel serving (1,000 mg total omega-3), the highest combined DHA+EPA in this category. Ritual Essential Prenatal includes 350 mg DHA from Schizochytrium sp. microalgae within the multivitamin itself — the most DHA built into a combined prenatal. Brands like Thorne Basic Prenatal and FullWell include no DHA, requiring a separate omega-3 supplement. A 2024 evaluation of 68 U.S. prenatal supplements found the mean DHA content was 368 mg among products that included it at all — but roughly half of prenatals on the market include no DHA whatsoever. Third-party certification (NSF, Clean Label Project) is important when choosing any supplement you will take daily through pregnancy.