A prenatal choline trial found higher IQ and less social withdrawal in 4-year-olds

Choline rarely makes headlines on its own. It is not one of the nutrients most people are told to watch, there is no RDA for it, only a less firmly established Adequate Intake, and most prenatal vitamins contain little or none of it. A new randomized trial from the University of Colorado Anschutz Medical Campus is the kind of study that could change that: a placebo-controlled trial of a choline supplement in pregnancy, with the children followed to age 4.

The study

The trial, led by Sharon K. Hunter and colleagues, was published online October 19, 2026 in the American Journal of Obstetrics & Gynecology. Researchers at University of Colorado Hospital prenatal clinics and affiliated community hospitals randomized 206 pregnant women to either 9,000 milligrams a day of phosphatidylcholine, a dietary form of choline, or a matching placebo, starting at 16 weeks of pregnancy and continuing through delivery. This is a randomized clinical trial, not an observational study, which is the strongest ordinary design for showing that an exposure, and not some other difference between the two groups of mothers, caused the outcome.

The trial's two pre-specified primary outcomes, assessed through parent-rated behavior checklists when the children turned 4, were attention problems and withdrawn or socially withdrawn behavior. Full-scale IQ, measured with the WPPSI-IV test, was a secondary outcome. Like most pregnancy trials that follow children for years, this one lost participants along the way: behavior ratings were completed for 142 of the 206 children, and IQ testing for only 103.

What the numbers actually show

The two primary outcomes split. Attention problems did not differ significantly between the choline and placebo groups. Withdrawn behavior problems were significantly less common in children whose mothers took phosphatidylcholine, the result the trial was actually designed and powered to detect.

The IQ finding is the one driving the headlines, and it is real but more fragile. Full-scale IQ averaged 106.0 in the phosphatidylcholine group versus 98.2 in the placebo group, a difference of 7.78 points (95% CI 1.88 to 13.7, p = .010). That is a meaningful gap on a test where 100 is the population average. But because the trial coincided with the COVID-19 pandemic, 20 women ended up receiving open-label phosphatidylcholine outside the original random assignment when the study protocol had to adapt. In a sensitivity analysis that excluded those 20 women, the withdrawn-behavior result held up, but the IQ confidence interval widened enough to include zero, meaning the IQ difference could no longer be called statistically significant on its own. The researchers also reported an exploratory finding that scores in the autism-symptom range were rarer in the choline group, but this was not a pre-specified outcome and the trial was not sized to test it.

Put plainly: this is a real randomized trial with a primary outcome that held up (less withdrawn behavior) and a secondary, more newsworthy outcome (higher IQ) that is promising but not fully robust once a pandemic-driven protocol change is accounted for. It is evidence worth taking seriously, not proof that any pregnant woman who supplements will have a measurably smarter child.

Getting enough choline

Choline is widespread in animal protein and, to a lesser extent, legumes and cruciferous vegetables. Amounts below are per realistic serving, ordered by density:

• Beef liver, pan-fried, 3 oz (85 g): 356 mg
• Egg, large, hard-boiled: 147 mg
• Beef, top round, cooked, 3 oz (85 g): 117 mg
• Soybeans, roasted, ½ cup: 107 mg
• Chicken breast, roasted, 3 oz (85 g): 72 mg
• Ground beef, cooked, 3 oz (85 g): 72 mg
• Cod, cooked, 3 oz (85 g): 71 mg
• Salmon, canned, 3 oz (85 g): about 75 mg
• Potato, red, baked with skin, 1 large: 57 mg
• Wheat germ, toasted, 1 oz: 51 mg
• Kidney beans, cooked, ½ cup: about 45 mg
• Milk, 1% milkfat, 1 cup: about 43 mg
• Quinoa, cooked, 1 cup: about 43 mg
• Broccoli, boiled and drained, ½ cup: 31 mg
• Cottage cheese, nonfat, 1 cup: 26 mg
• Peanut butter, smooth, 2 tbsp: about 20 mg

How much you need

Choline does not have a full RDA, because the evidence base is considered less complete than for most essential nutrients; instead the National Academies sets an Adequate Intake:

• Men, 19 and up: 550 mg
• Women, 19 and up: 425 mg
• Pregnancy: 450 mg
• Breastfeeding: 550 mg
• Teen boys, 14 to 18: 550 mg
• Teen girls, 14 to 18: 400 mg
• Children 9 to 13: 375 mg
• Children 4 to 8: 250 mg
• Children 1 to 3: 200 mg
• Infants 7 to 12 months: 150 mg
• Infants 0 to 6 months: 125 mg

The tolerable upper intake level for adults is 3,500 mg a day from food and supplements combined, stepping down to 3,000 mg for teens 14 to 18, 2,000 mg for children 9 to 13, and 1,000 mg for children 1 to 8; no upper limit has been established for infants. The dose used in this trial, 9,000 mg a day of phosphatidylcholine, was well above that adult ceiling and was administered and monitored as part of a research protocol, not a consumer recommendation.

Too little, and too much

Deficiency is uncommon in people eating a varied diet, in part because the body can synthesize some choline on its own, though not usually enough to meet needs without dietary intake. When choline intake drops too low, the NIH Office of Dietary Supplements notes it can cause muscle and liver damage, including fat deposits in the liver. Pregnant women, whose choline needs rise to support the growing fetus, and people eating strict vegan diets with little soy are among the groups more likely to fall short of the Adequate Intake, even though most Americans do not meet it and relatively few show clear symptoms.

Too much choline, mainly from concentrated supplements rather than food, has been linked to a fishy body odor, sweating, and low blood pressure; the adult upper limit was set specifically because high intakes can cause hypotension. Liver effects have also been reported at very high doses. None of this applies to the amounts found in ordinary foods, even choline-dense ones like liver and eggs.

Tracking it in AIM

AIM does not track choline as standard, so add it as a custom metric: give it a name, a unit (mg) and a daily target of 425 mg (550 mg for men, 450 mg during pregnancy, 550 mg while breastfeeding), and it is estimated on every meal from then on, pinned to your cards or left behind "more". Any custom nutrient works the same way.

Estimates from a photograph carry real uncertainty for micronutrients, because content varies with soil, cultivar, storage and cooking in ways no image contains. Treat the week as meaningful and any single day as approximate, and treat this one trial's IQ finding the same way: a promising secondary result worth watching for replication, not a settled number to build a pregnancy around.