# 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.

*Published 2026-06-25 · By Dana Whitfield, RD*

The short answer
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](https://www.goodrx.com/conditions/pregnancy/omega-3-supplements-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.

At a glance: DHA targets by guideline source
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](https://www.supplementscored.com/supplements/algal-oil/). 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.

  DHA Prenatal Supplement Comparison (Selected Products, 2026)

      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%](https://www.ajogmfm.org/article/S2589-9333(23)00393-2/fulltext) — 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.*

## Sources

1. [Dietary Supplements and Life Stages: Pregnancy — Health Professional Fact Sheet](https://ods.od.nih.gov/factsheets/Pregnancy-HealthProfessional/)
2. [How Much DHA Should You Take During Pregnancy? Safety & FAQs](https://www.goodrx.com/conditions/pregnancy/omega-3-supplements-pregnancy)
3. [Omega-3 fatty acid supply in pregnancy for risk reduction of preterm and early preterm birth](https://www.ajogmfm.org/article/S2589-9333(23)00393-2/fulltext)
4. [2024 Clinical Practice Guideline on Omega-3 (DHA/EPA)](https://www.crnusa.org/sites/default/files/weekly/24-05-15/Clinical_Practice_Summary_US-letter_digital-FINAL.pdf)
5. [Omega-3 Fatty Acids: FAQs](https://americanpregnancy.org/healthy-pregnancy/pregnancy-health-wellness/omega-3-fatty-acids-faqs/)
6. [Algal Oil: Benefits, Dosing & Top Picks](https://www.supplementscored.com/supplements/algal-oil/)
7. [Prenatal DHA — Product Page](https://www.nordic.com/products/prenatal-dha/)
8. [Prenatal Omega-3 — Product Page](https://thisisneeded.com/products/prenatal-omega-3)
9. [Essential Prenatal Multivitamin — Product Page](https://ritual.com/products/essential-prenatal-multivitamin)

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Source: https://natalnew.com/nutrition/how-much-dha-during-pregnancy
Index: https://natalnew.com/llms.txt · Full text: https://natalnew.com/llms-full.txt