Choline in Pregnancy: What the New IQ Study Found, How Much You Need (450 vs 900 mg) and Whether Eggs Are Enough

By Sofía Castillo•Updated October 27, 2026

Choline in pregnancy went from a footnote to front-page news on October 19, 2026, when a randomized trial in the American Journal of Obstetrics & Gynecology found that children whose mothers took a choline supplement from week 16 scored about eight points higher on an IQ test at age 4. That's a striking result, and it comes with real caveats. Here is exactly what the study found, how much choline you need (450 mg is the official target, while the researchers now suggest 900 mg), whether eggs are enough, and how to choose a supplement without overdoing it.

We read the trial abstract and the university's announcement, checked every number against the NIH Office of Dietary Supplements and ACOG, and pulled choline amounts from current supplement labels on October 24, 2026. Where the evidence is thin, we say so.

Quick answer

• Daily target: 450 mg of choline in pregnancy and 550 mg while breastfeeding (NIH, ACOG). The upper limit is 3,500 mg a day from food and supplements combined.
• Most women fall short: about 90% to 95% of pregnant women eat less than 450 mg, and the average US woman gets about 278 mg.
• Your prenatal probably won't fix it: popular prenatals list 0 to 110 mg; only a few reach 400 to 450 mg, and they take 4 to 8 capsules.
• The new study: 9,000 mg of phosphatidylcholine a day from week 16 raised children's IQ at age 4 by an average of 7.78 points and cut parent-rated social withdrawal. Attention didn't change.
• The caveats: a third of families dropped out, behavior was rated by parents, and the autism finding is exploratory.
• Eggs: two large eggs give about 294 mg, or 65% of the daily target. Cook them until the yolk is firm.
• Next step: add up your prenatal and your diet, then ask your OB-GYN or midwife whether a choline supplement makes sense for you.

What the new choline IQ study found

The trial ran at University of Colorado prenatal clinics and affiliated community hospitals. Researchers randomly assigned 206 pregnant women to take either 9,000 mg of phosphatidylcholine (the form of choline that occurs naturally in eggs and meat) or a placebo every day from 16 weeks of pregnancy until delivery. All women were encouraged to take a standard prenatal vitamin and eat choline-containing foods. Parents rated their children's behavior from 18 months to 4 years, and the children took a standard IQ test (the WPPSI-IV) at ages 3 and 4.

Senior author Dr. Robert Freedman called it the largest randomized trial of prenatal choline supplementation so far. The team's explanation is that choline reaching the baby activates a receptor made by the CHRNA7 gene, which helps developing nerve cells build the connections they need before birth.

What the study can't tell you yet

• A third of families dropped out. 206 women enrolled, but 142 children were assessed by parents and only about 100 had IQ scores in the analysis. If dropouts differed between the groups, the results could shift.
• Behavior was parent-rated. Parents filled out a checklist rather than blinded clinicians doing an assessment, though the trial itself was placebo-controlled.
• IQ was a secondary outcome. The two main questions were social withdrawal and attention, and only one of them improved.
• The autism signal rests on 11 children. It's interesting, but it's a hypothesis to test, not a reason to expect a supplement to prevent autism.
• One research group, one region. It hasn't been repeated by an independent team yet, and we don't know whether the IQ gap lasts past age 4.

How it fits with earlier research

It isn't the first hint. The same Colorado group earlier found that prenatal phosphatidylcholine improved newborn brain-wave measures and reduced attention and social withdrawal problems at 40 months. At Cornell, a carefully controlled feeding study gave women in their third trimester either 480 or 930 mg of choline a day; babies in the higher group had faster information-processing speed through their first year. None of these studies is large, but they point the same way.

How much choline do you need during pregnancy? 450 vs 900 mg

The official answer is 450 mg a day. That's the Adequate Intake set by the National Academies, and it's what ACOG and the NIH use. The new trial's authors think more helps: they now suggest 900 mg of choline, or 7,200 mg of phosphatidylcholine, a day, a little less than the dose they tested. That's their recommendation as researchers, not an official guideline.

Why the difference between milligrams of phosphatidylcholine and milligrams of choline? Choline makes up only about 13% of a phosphatidylcholine molecule by weight. So 9,000 mg of phosphatidylcholine delivers roughly 1,100 to 1,200 mg of actual choline. Supplement labels list one or the other, and mixing them up is the most common dosing mistake.

Why don't doctors recommend choline?

Many do, as part of a healthy diet: ACOG lists choline, at 450 mg a day, among the key nutrients of pregnancy and names eggs, milk, beef liver, peanuts and soy as sources. What's missing is formal guidance on supplements, and especially on doses above 450 mg, because only a handful of randomized trials exist. Choline is also left out of most prenatal vitamins, so it often doesn't come up at prenatal visits unless you raise it. Bringing this study to your next appointment is a reasonable way to start that conversation.

Why your prenatal vitamin probably isn't enough

The NIH notes that prenatal supplements typically contain little if any choline. Part of the reason is size: choline is bulky. To get 450 mg of choline from choline bitartrate you need about 1,100 mg of powder, before any of the other vitamins. That's why the prenatals that do reach the target ask for 4 to 8 capsules a day.

Even with a choline-rich prenatal, check the rest of the label. Some high-choline formulas, such as Needed's, leave iron out on purpose (the brand sells it as a separate supplement), and iron needs rise from 18 to 27 mg a day in pregnancy. If you've been told your iron is low, our guide to low ferritin with normal hemoglobin explains which blood tests to ask for.

Choline-rich foods: how much is in what you eat

Eggs, meat, fish, dairy and soy carry most of the choline in a typical diet. Here are amounts per serving from the NIH Office of Dietary Supplements, which draws on USDA FoodData Central, with a pregnancy note where it matters.

Is 2 eggs enough choline for pregnancy?

Two large eggs give about 294 mg of choline, roughly 65% of the 450 mg target, so they're the easiest single step you can take. They won't get you all the way on their own, but a normal day of food usually closes the gap:

Reaching the 900 mg the trial's authors suggest from food alone would take about six eggs a day, which is why Dr. Freedman says supplements are needed to hit that level. Whatever you eat, the FDA advises pregnant women to cook eggs until both the yolk and white are firm, and to skip raw batter, homemade dressings and eggnog made with raw eggs.

If you eat little or no meat or eggs

Vegetarian and especially vegan diets make 450 mg hard to reach. Roasted soybeans, soy milk, beans, quinoa, wheat germ, broccoli and Brussels sprouts all help, but you would need large portions every day. This is the group most likely to benefit from a choline supplement, so ask about it early, ideally while you're still trying to conceive.

Choline bitartrate vs phosphatidylcholine: which form?

There are three common forms in supplements, and the NIH notes that no study has directly compared how well each is absorbed. What we do know:

In practice, most women who supplement use choline bitartrate because the pill count is manageable. If you want to follow the trial more closely with phosphatidylcholine, be ready for a lot of softgels, and talk to your provider about the total dose first.

Best choline supplements for pregnancy (and prenatals with choline)

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These are products we checked on October 24, 2026, with the choline amount on the current label. We don't list prices because they change daily. None of them is "the" answer; the right one depends on how much choline your prenatal and your diet already give you.

A simple way to decide: write down the choline in your prenatal, estimate your food (two eggs is about 300 mg), and see how far you are from 450 mg. A single 250 or 500 mg choline tablet closes the usual gap. If you and your provider decide to aim for the trial authors' 900 mg, you'll know exactly how much to add, and you'll still be far below the 3,500 mg upper limit.

Which trimester is best for choline?

All of them, but the evidence is strongest from the second trimester on. ACOG notes choline may help prevent some birth defects that form in the first weeks, and demand rises as the baby's brain grows quickly in the second and third trimesters. The Colorado trial started at week 16; the Cornell study added choline in the third trimester. If you're planning a pregnancy, starting with a prenatal that includes some choline before you conceive means you're covered from day one. After birth, keep it up while breastfeeding, when the target rises to 550 mg.

Is there a connection between choline and autism?

The honest answer is maybe, and it isn't proven. In the 2026 trial, 1 of 71 children in the choline group and 10 of 71 in the placebo group had autism-range scores on a parent checklist along with language delays typical of autism. The authors call this an exploratory analysis: it wasn't one of the trial's main questions, it's based on 11 children, and the confidence interval is extremely wide. Nothing here shows that choline prevents autism. It's a lead for larger, independently run trials.

Side effects, the upper limit and who should be careful

At the amounts in food and typical supplements, choline is well tolerated, and the Colorado trial reported no significant supplement-related safety problems at a high dose. Problems show up at very high intakes. According to the NIH, too much choline can cause:

• A fishy body odor
• Vomiting, nausea or diarrhea
• Excessive sweating and salivation
• Low blood pressure, which can make you dizzy
• Liver toxicity at extreme intakes

The upper limit of 3,500 mg a day (3,000 mg if you're 18 or younger) counts food and all supplements together. There's also an open question about TMAO, a compound gut bacteria make from choline that's been linked to heart disease in adults. In a 2021 trial in non-pregnant adults, choline bitartrate raised TMAO while eggs and phosphatidylcholine didn't. What that means in pregnancy isn't known.

Talk to your provider before taking choline if you

• Have trimethylaminuria (fish odor syndrome)
• Have low blood pressure or faint easily
• Have kidney or liver disease
• Are allergic to soy (most phosphatidylcholine and lecithin is made from soy)
• Already take several products that contain choline, such as a prenatal plus a separate choline supplement plus a protein shake

The NIH lists no clinically relevant drug interactions for choline, but bring every bottle to your appointment anyway.

When to talk to your doctor or midwife

• You're planning a pregnancy or just got a positive test (see how soon you can test) and want to choose a prenatal.
• You eat few eggs, meat or dairy, or you're vegetarian or vegan.
• You're thinking about a higher dose, such as the 900 mg the trial authors suggest.
• You notice a fishy body odor, dizziness, vomiting or diarrhea after starting a supplement.
• You have severe nausea or vomiting and can't keep food or vitamins down. Call your provider the same day if you can't keep fluids down.

No insurance yet? You can still get prenatal care at community health centers while coverage comes through; our guide for pregnant women without health insurance shows where to start.

Questions to bring to your next prenatal visit

1. How much choline is in my prenatal, and is it enough with what I eat?
2. Should I add a choline supplement, and at what dose?
3. Is choline bitartrate fine for me, or would you prefer another form?
4. Does anything in my health history make extra choline a bad idea?
5. Should I keep taking it while breastfeeding?

Frequently asked questions

This article is for general information, was last updated on October 24, 2026, and is not medical advice. Choline research is moving fast. Talk to your OB-GYN or midwife before you start, stop or change any supplement during pregnancy.

Sources

• Hunter SK, Hoffman MC, Law AJ, et al. Prenatal maternal phosphatidylcholine and children's behavior and cognition through 4 years of age: randomized clinical trial. American Journal of Obstetrics & Gynecology, online October 19, 2026
• University of Colorado Anschutz: Prenatal supplement linked to improved child cognition and social behavior (October 20, 2026)
• ClinicalTrials.gov: NCT03028857, prenatal phosphatidylcholine trial registration
• NIH Office of Dietary Supplements: Choline fact sheet for health professionals (intakes, food table, upper limits)
• NIH Office of Dietary Supplements: Dietary supplements and life stages, pregnancy
• ACOG: Healthy eating during pregnancy (choline, 450 mg a day)
• Caudill MA, et al. Maternal choline supplementation during the third trimester improves infant information processing speed. FASEB Journal, 2018
• Wilcox J, et al. Dietary choline supplements, but not eggs, raise fasting TMAO levels: a randomized clinical trial. American Journal of Medicine, 2021
• FDA: Dairy and eggs, food safety for moms-to-be
• NHS: Foods to avoid in pregnancy (liver and vitamin A)
• USDA FoodData Central (choline content of foods)

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