A new Consumer Reports investigation reveals a troubling gap between what prenatal vitamin labels promise and what's actually inside the bottle. Of 17 popular prenatal vitamins tested, 15 contained nutrient levels that differed from their labels, with some falling significantly short on essential pregnancy nutrients like folate and folic acid.

Why Does Label Accuracy Matter for Prenatal Supplements?

Prenatal vitamins aren't just another dietary supplement sitting on the shelf next to general multivitamins. They're specifically formulated to meet the heightened nutritional demands of pregnancy and support critical fetal development during narrow developmental windows that can't be repeated or corrected later.

"Prenatal vitamins are specifically formulated to meet the increased nutritional demands of pregnancy, support maternal and fetal development, and reduce the risk of adverse outcomes associated with inadequate nutrient intake," explained Amy R. Nichols, PhD, RDN, spokesperson for the Academy of Nutrition and Dietetics and an assistant professor in the department of nutrition at the University of California, Davis.

Amy R. Nichols, PhD, RDN, Academy of Nutrition and Dietetics

About 78 percent of pregnant people in the United States use dietary supplements during pregnancy, according to a 2024 estimate. The American College of Obstetricians and Gynecologists and the Academy of Nutrition and Dietetics both recommend prenatal vitamins widely before and throughout pregnancy. For something so universally recommended during such a vulnerable time, consumers reasonably expect the supplements to contain what the label says they do.

The problem is that dietary supplements, including prenatals, are regulated by the Food and Drug Administration (FDA) similarly to food, not like prescription medications. Unlike drugs, supplements can be sold without prior safety or effectiveness checks by the FDA. While manufacturers must follow Current Good Manufacturing Practices (cGMPs) to ensure quality, there's no regulated definition in the United States for what a prenatal vitamin is or what it must contain.

What Did Consumer Reports Actually Find?

Consumer Reports tested 17 over-the-counter prenatal vitamins in various forms, including capsules, tablets, softgels, and gummies. The scientists analyzed each product for heavy metals (arsenic, cadmium, lead, and mercury) and for specific nutrients critical to pregnancy: calcium, iron, zinc, vitamins A, C, D, and E, folate, and riboflavin.

The good news: only trace amounts of heavy metals were detected, and only in three of the products tested. The concerning news: nearly all products fell short. Specifically, 15 of the 17 prenatal vitamins contained nutrient levels that were either lower or higher than what appeared on the Supplement Facts label. Half of the gummy prenatals tested, 4 of 8 products, contained folate levels well below the amounts listed on the label.

Only two products, Carlyle For Her Prenatal Multi-Vitamin and Mineral Formula and Bird&Be Complete Prenatal Pack, contained nutrient levels that aligned with the labeled amounts in Consumer Reports' testing.

"Pregnancy has narrow developmental windows, and you can't go back and redo them," noted Lauren Manaker, RDN, LD, a registered dietitian who specializes in fertility and pregnancy.

Lauren Manaker, RDN, LD, Registered Dietitian

How to Evaluate Your Prenatal Supplement

• Check the Supplement Facts label: Review the amounts of key nutrients listed, especially folate or folic acid, iron, iodine, calcium, and zinc. Compare these amounts to recommendations from your healthcare provider or the Academy of Nutrition and Dietetics.
• Understand USP standards: The United States Pharmacopeia (USP) sets voluntary tolerance thresholds for supplement nutrients, typically requiring a minimum of 90 percent of the labeled amount, though manufacturers aren't required to follow these standards.
• Discuss with your healthcare provider: Talk to your OB-GYN or midwife about which prenatal supplement is right for you, especially if you're considering switching brands or formulations during pregnancy.
• Look for third-party testing: Some manufacturers voluntarily submit products to third-party testing organizations that verify label accuracy and screen for contaminants, though this isn't required by law.

Experts emphasize that all the products tested in this investigation are safe to consume, and if you're currently taking a prenatal supplement, you should not stop without consulting your doctor. The findings, however, underscore a critical gap in oversight and standardization around prenatal supplements specifically, and dietary supplements in general.

"When label information is inaccurate, consumers are left without a reliable way to know what they're taking," stated Vanessa Nicholson-Robinson, DrPH, MPH, an assistant professor of public health and community medicine at Tufts University School of Medicine in Boston.

Vanessa Nicholson-Robinson, DrPH, MPH, Tufts University School of Medicine

Consumer Reports' scientists and advocates are pushing for stronger oversight and baseline standards for prenatal supplements. The findings highlight why transparency matters: many patients assume all prenatal supplements contain the same nutrients and have all the nutrients important for pregnancy, so they may not closely examine the label, according to a 2023 report from the Government Accountability Office (GAO).

The takeaway is clear: when it comes to prenatal nutrition, label accuracy isn't a minor quality issue. It's a public health concern that affects the health of both pregnant people and their developing babies. Until stronger federal oversight is in place, reading labels carefully and discussing supplement choices with your healthcare provider remains your best defense.