What should I look for in a prenatal vitamin?
Look for at least 400 mcg of folic acid and 150 mcg of iodine (as potassium iodide). Then check for choline, which most prenatals leave out, and for DHA, which often comes as a separate softgel. Skip cod liver oil and separate vitamin A (retinol) supplements. Bring the bottle to your doctor or midwife and ask if it fits you.
On this page
The five lines to check first
Prenatal shelves are crowded, and the front of the bottle tells you very little. Turn it over. The Supplement Facts panel is where the answer is. You are checking five lines, in this order.
| Nutrient | What to look for | Why it matters |
|---|---|---|
| Folic acid | At least 400 mcg | The only form of folate shown to help prevent neural tube defects (CDC) |
| Iodine | 150 mcg, as potassium iodide | Your thyroid needs it to make the hormone that helps build the baby's brain |
| Choline | Listed in mg; most prenatals have little or none | Pregnancy target is 450 mg a day from all sources |
| DHA | Milligrams of DHA, often in a separate softgel | An omega-3 fat built into the brain and eyes |
| Iron | An amount your doctor agrees with | The daily target rises to 27 mg in pregnancy |
If a line is missing, that doesn't make the vitamin bad. It tells you what you need to get from food, or ask your doctor about adding.
Folic acid: the line with a clear answer
The CDC recommends that every woman who could become pregnant get 400 mcg of folic acid a day, starting at least a month before conception. The neural tube, which becomes the brain and spinal cord, closes by about day 28 of pregnancy. That is often before a test turns positive.
Some labels list methylfolate (also called L-methylfolate or 5-MTHF) instead of, or as well as, folic acid. Methylfolate raises blood folate well. But the CDC says folic acid is the only type of folate shown to help prevent neural tube defects. A product that gives you the full 400 mcg of folic acid, with methylfolate added if you like it, means you don't have to pick a side. Our page on methylfolate vs folic acid walks through the debate.
If you've had a pregnancy affected by a neural tube defect, have diabetes, or take seizure medicine, your doctor may prescribe a higher dose. Take what they prescribe.
Free: the 60-second Prenatal Label Check
Check your prenatal vitamin against what the research says a growing brain needs, and get Part 1 of the book free.
Iodine and choline: the lines labels often skip
Iodine. In a look at 59 best-selling US prenatals, only 34 (about 58%) contained iodine. In a 2025 lab test of 47 US prenatals, 53% listed iodine, and only 4 of those actually contained the amount on the label. The American Thyroid Association recommends 150 mcg a day as potassium iodide for women who are planning a pregnancy, pregnant or breastfeeding. Look for the words "iodine (as potassium iodide)." Our iodine guide covers food sources and the sea-salt trap.
Choline. The NIH says prenatal supplements "typically contain little if any choline." In the same 2025 test, only 12 of 47 prenatals listed choline at all, and only 5 of those 12 contained the labeled amount. Fewer than 1 in 10 US pregnant women reach the 450 mg target. If your prenatal has no choline, eggs do most of the work: one large egg has about 147 mg. See how much choline you need.
A choline tip: "lecithin" on a label is not the same as choline. Lecithin holds much less choline than its number suggests. Look for a line that says "Choline" with an amount in mg.
DHA, iron and vitamin D
DHA. Many prenatals come with a separate DHA softgel. The front may say "fish oil 1,000 mg," but that is the oil, not the DHA. Find the DHA line and check the serving size, since "500 mg DHA" might be per two softgels. In a large review of omega-3 trials, the best results for carrying a baby to term came from 500 to 1,000 mg of long-chain omega-3 a day, with at least 500 mg as DHA. How much you need depends on how much fish you eat, so ask your doctor. Our DHA page has the details.
Iron. The US recommended amount rises to 27 mg a day in pregnancy, and the safe upper limit is 45 mg. More isn't always better. If your blood test shows low iron, your doctor will tell you how much to take.
Vitamin D. The US recommended amount in pregnancy is 600 IU (15 mcg) a day, with an upper limit of 4,000 IU. In a Danish trial, a much higher dose did not change children's development by age 6. The standard dose is enough for most people.
What to skip or watch
- Vitamin A as retinol. The NHS advises pregnant women not to take cod liver oil or any supplement with retinol. Prenatals made for pregnancy usually handle this, but check any extra supplement you add.
- Kelp and seaweed supplements. Seaweed iodine varies hugely, from 16 to 2,984 mcg per gram. A scoop can easily pass the safe upper limit of 1,100 mcg a day. Skip them unless your doctor says otherwise.
- Stacking products. Two multivitamins plus a "pregnancy gummy" can double up on iron, vitamin A or iodine. Add it up before you add more.
- Megadoses. More isn't better on your own. WHO sees no added benefit from iodine above 500 mcg a day, a high vitamin D dose didn't change children's development in a Danish trial, and in one Spanish study, mothers taking over 5,000 mcg of folic acid a day had children with slightly lower movement scores. Stick to the amounts above unless your doctor prescribes more.
Third-party seals can help. An independent seal such as USP Verified or NSF Certified means someone outside the company checked what's inside. Labels aren't always accurate, which is one more reason to get your key nutrients from food as well.
Pick one you'll actually take
The best prenatal is the one you swallow every day. Start it about three months before you try to conceive if you can. That fills your folate stores, gets iodine into your thyroid, and gives you time to find a brand you can get down before morning sickness arrives. If big tablets make you gag, ask about smaller pills or a different form.
If you're reading this already pregnant, start today and tell your doctor or midwife. Keep the bottle next to your toothbrush and take it at the same time each day. Then bring it to your next visit and ask one simple question: "Does this cover what I need?"
Do this
- Turn your prenatal over tonight and write down the folic acid, iodine, choline, DHA and iron amounts.
- Check that folic acid is at least 400 mcg and iodine is 150 mcg as potassium iodide.
- Count how many eggs you eat in a week to see how far you are from 450 mg of choline.
- Make sure you're not adding cod liver oil or a separate vitamin A (retinol) supplement on top of your prenatal.
- Bring the bottle to your next appointment and ask if it suits your health and diet.
When to ask your doctor
Check with your doctor or midwife first if…
- You have a thyroid condition, since iodine amounts that are fine for others can affect you.
- You've had a pregnancy affected by a neural tube defect, have diabetes, take seizure medicine or have had weight-loss surgery (you may need a higher folic acid dose).
- You take any prescribed medicine, including blood thinners, before adding DHA or other supplements.
- Your doctor has prescribed iron, so you don't double up.
Call your doctor now if…
- You can't keep food, fluids or your vitamin down for 24 hours.
- You have any vaginal bleeding, fluid leaking or severe belly pain (call your doctor or 911 now).
- Your pee is very dark, you haven't peed in 8 hours, or you feel faint when you stand.
This page is general information, not medical advice. Every pregnancy and every child is different. Ask your doctor, midwife or pediatrician before changing supplements, diet or care.
Grow a Genius
In the book: Chapter 8: The Forgotten Nutrient: Choline
Chapters 4, 7 and 8 explain each line on the label, and the printable Prenatal Label Decoder lets you check your bottle against every brain nutrient's daily target in about 60 seconds.
- The 7 Genius Builders, stage by stage
- 16 printable guides, including the Prenatal Label Decoder
- Built on 500+ sources from 35+ countries
- 90-day Double Guarantee
People also ask
Are expensive prenatals better?
Price doesn't tell you much. What matters is the label: at least 400 mcg of folic acid, 150 mcg of iodine, and a plan for choline and DHA. In a 2025 lab test, many products didn't contain what their labels claimed, so a third-party seal can help more than a high price.
Is a gummy prenatal okay?
It can be, if the label covers the basics. Check the folic acid, iodine and iron lines the same way you would on a tablet. If a gummy is the only thing you can keep down, it beats a tablet you skip. Ask your doctor whether you need anything added.
Do I still need a prenatal if I eat well?
Folic acid is the one supplement with a clear answer: the CDC recommends 400 mcg a day for anyone who could become pregnant. Iodine and choline are hard to get from a modern diet too. Food still matters, and a prenatal is a safety net under it.
Should my prenatal contain methylfolate instead of folic acid?
Folic acid is the only form shown to help prevent neural tube defects. Methylfolate raises blood folate well but hasn't been tested for that job. If you prefer methylfolate, choose a product that also gives the full 400 mcg of folic acid, and talk it over with your doctor.