Prenatal Vitamins: How to Choose One That Meets ACOG Standards

Prenatal multivitamins are a $1.6-billion U.S. market and almost every brand claims to provide "complete" prenatal nutrition. The reality, when measured against the American College of Obstetricians and Gynecologists' (ACOG) committee opinions and the National Academies' Dietary Reference Intakes, is that most over-the-counter prenatals are missing or under-dosing several key nutrients. This is what to actually look for on the label.

Folate or Folic Acid: 600–1,000 mcg DFE

The single most consequential prenatal nutrient. The U.S. Public Health Service recommends 400 mcg/day of folic acid for all women capable of pregnancy and 600 mcg/day during pregnancy itself. Neural tube closure occurs by day 28 post-conception, before most women know they are pregnant. Either folic acid or methylated folate (5-MTHF / L-methylfolate) is acceptable; women with two MTHFR C677T variants may prefer 5-MTHF.

Iron: 27 mg

The Institute of Medicine's RDA for pregnancy is 27 mg/day. Most multivitamins meet this; the question is whether you tolerate the form. Ferrous bisglycinate causes less constipation than ferrous sulphate but is more expensive. Take with vitamin C and away from calcium, dairy, and thyroid medication.

Iodine: 150 mcg

The American Thyroid Association recommends 150 mcg/day of iodine for all pregnant and lactating U.S. women, but the AAP's 2014 review found that fewer than 50% of prenatal vitamins on the U.S. market contain it. Iodine deficiency in pregnancy is the leading global cause of preventable cognitive impairment in offspring. Check the label and verify "potassium iodide" or "iodine" appears with at least 150 mcg.

Choline: 450 mg

Almost universally absent from over-the-counter prenatals or present at token doses (e.g., 25–55 mg). The 2017 AMA resolution called on manufacturers to add choline at evidence-based levels; only a few prenatals (Needed, FullWell, Ritual Essential, ChlorPhos) do so as of 2026. If your prenatal lacks choline, eat eggs daily or add a stand-alone choline supplement.

DHA: 200 mg minimum

ACOG and the FAO recommend at least 200 mg DHA/day in pregnancy and lactation. Many prenatals omit DHA or sell it as a separate softgel. Algal DHA is plant-based and lower in mercury than fish oil; either is acceptable.

Vitamin D: 600–2,000 IU

The IOM RDA is 600 IU/day; the Endocrine Society recommends 1,500–2,000 IU/day for pregnant women. Most U.S. women enter pregnancy with insufficient 25(OH)D levels. Check baseline levels and supplement to a target of 30–50 ng/mL.

Calcium: At Least 250 mg in the Multi

The pregnancy RDA is 1,000 mg/day, but calcium and iron compete for absorption, so prenatals typically provide 200–300 mg with the expectation that most calcium will come from food. If you don't consume dairy, fortified plant milks, or cooked greens daily, take a separate calcium supplement at a different time of day.

Avoid Vitamin A as Retinol Above 5,000 IU

Pre-formed vitamin A (retinol or retinyl palmitate) above 10,000 IU/day is teratogenic. Look for vitamin A as beta-carotene only, or as retinol below 5,000 IU. This is a non-negotiable safety check — high-dose retinol multivitamins should never be taken in early pregnancy.

What to Skip

Herbal additions in prenatals (e.g., chasteberry, red raspberry leaf, ginger) are not evidence-based and the safety of most botanicals in pregnancy is poorly characterized. Choose a prenatal without herbal additions and add ginger only as needed for nausea.