Can Prenatal Vitamins Make You Sick and What to Do About It

Can prenatal vitamins make you sick? For some women, unfortunately, yes. Prenatal vitamins are packed with essential nutrients to support a healthy pregnancy, but they can sometimes cause discomfort like nausea or bloating. If this sounds like you, don’t worry—you’re not alone, and it doesn’t mean you have to stop taking them. Let’s talk about why this happens, how you can manage it, and why these vitamins are super important for both you and your baby.

Why Do Prenatal Vitamins Make Some Women Feel Sick?

Nausea during pregnancy—often called "morning sickness"—is very common, especially in the first trimester. But for some women, prenatal vitamins make it worse. So, can prenatals make you sick? Yes, and here’s why.

Iron is one of the main reasons. Your body needs extra iron during pregnancy to prevent anemia and support your baby’s growth. But too much iron can irritate your stomach and cause nausea, bloating, or even constipation [1].

Then there’s folic acid, which is essential for preventing neural tube defects in the baby. It’s important, no doubt about it. But for some women, it might trigger mild digestive issues, like feeling a bit gassy or losing your appetite.

Lastly, the size and smell of the vitamins themselves can be a problem. Let’s be real—some of these pills are huge, and if you’re already sensitive to smells during pregnancy, even the slightest odor can turn your stomach [2].

Skipping Prenatal Vitamins Due to Nausea

Some women think about skipping prenatal vitamins due to nausea because the discomfort feels unbearable. But skipping them altogether isn’t a good idea. Prenatal vitamins contain essential nutrients like folic acid, DHA, and vitamin D, all of which play a big role in your baby’s brain and spinal cord development. Interestingly, many people wonder about the benefits of prenatal vitamins when not pregnant, as these nutrients can also support overall health. These nutrients are especially critical during the first trimester when so much is happening with your baby’s growth.

If you’re struggling, it’s better to look for alternatives. Some prenatal vitamins come in chewable, gummy, or liquid forms, which might be easier on your stomach. Talk to your doctor if the one you’re taking isn’t working for you—they can help you find an option that suits you better [3].

How to Ease Nausea From Prenatal Vitamins

If you’re feeling sick after taking prenatal vitamins, don’t give up. There are some simple ways to make it easier.

One of the easiest fixes is to take your natural prenatal vitamins with food. Swallowing them on an empty stomach is a recipe for nausea. Even a light snack, like a handful of crackers or a small cup of yogurt, can make a big difference.

You can also try switching to a “gentle” formula. Some prenatal vitamins are designed with lower iron levels or chelated iron, which is easier on the stomach.

Timing matters too. If you usually take your vitamins in the morning and feel queasy afterward, try taking them at night instead. For some women, it’s just a matter of finding the right time of day.

If the size of the pills is the issue, look for smaller capsules or split the dose into two portions. Taking half in the morning and the other half at night can help reduce nausea [4].

Ingredients That Can Help

✨ Start Your Prenatal Care Today

Our Prenatal Vitamins with DHA, Choline & Folate provide the essential nutrients you and your baby need for a healthy start.

Shop Now — $34.95

✓ Free shipping on orders over $40  |  ✓ Trusted by millions of couples worldwide

Certain ingredients in prenatal vitamins can actually help reduce nausea. Vitamin B6, for example, is known to ease morning sickness. Some prenatal supplements include ginger root, which has long been used as a natural remedy for nausea [5].

Minerals like calcium and magnesium can also help regulate muscle function and reduce discomfort in your stomach. These nutrients are especially helpful if you’re dealing with cramps or an upset stomach.

For women who are trying to conceive, ingredients like CoQ10 and L-arginine are worth looking into. They boost cellular energy and support overall fertility health [6].

Can Prenatals Make You Sick

Yes, can prenatals make you sick? They absolutely can, depending on the formulation and your body’s sensitivity. But there’s good news. Switching to a different type of prenatal vitamin, like gummies or liquids, can make a huge difference. Some supplements use bioavailable forms of nutrients, like methylated folate instead of synthetic folic acid, which are easier for the body to absorb and less likely to cause side effects [7].

Supporting a Healthy Pregnancy

Taking prenatal vitamins is just one piece of the puzzle. Staying hydrated is also really important, especially since dehydration can make nausea worse. Aim to drink plenty of water throughout the day to keep your body functioning at its best [8].

Eating small, frequent meals can also help. Stable blood sugar levels make a big difference, so try to eat every few hours, even if it’s just something light like toast or fruit.

If you’re dealing with constipation (thanks, iron!), adding probiotics or fiber-rich foods like whole grains, veggies, or yogurt to your diet can help keep things moving.

For those planning to conceive, starting prenatal vitamins early—at least three months before trying—can help your body adjust and ensure you have the right nutrients on board from the start [9].

The Bottom Line

Can prenatal vitamins make you sick? Yes, but that doesn’t mean you should stop taking them. They’re packed with nutrients that are essential for your baby’s development, especially in the early stages. If you’re considering skipping prenatal vitamins due to nausea, try switching to a gentler formula or adjusting how and when you take them. And if you’re still wondering, can prenatals make you sick?—remember that every woman’s experience is different. Finding the right solution is key to a healthy and comfortable pregnancy.

FAQs

What should I do if prenatal vitamins make me feel sick?

Try taking them with food or at a different time of day. You can also switch to a gummy or liquid version.

Can I stop taking prenatal vitamins if they make me nauseous?

It’s not a good idea to stop. Talk to your doctor about alternatives that may work better for you.

What’s the best time of day to take prenatal vitamins?

The best time is whenever you feel least nauseous. Many women find taking them before bed helps.

Are gummy prenatal vitamins as good as pills?

Yes, but some may not contain iron. Check the label to ensure you’re getting all the nutrients you need.

How early should I start prenatal vitamins?

Start at least three months before trying to conceive. Early supplementation supports both fertility and fetal development.

Citations

1. Milman N. (2006). Iron and pregnancy--a delicate balance. Annals of hematology. Available at: https://pubmed.ncbi.nlm.nih.gov/16691399/
2. Keats, E. C., Oh, C., Chau, T., Khalifa, D. S., Imdad, A., & Bhutta, Z. A. (2021). Effects of vitamin and mineral supplementation during pregnancy on maternal, birth, child health and development outcomes in low- and middle-income countries: A systematic review. Campbell systematic reviews. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC8356361/
3. Czeizel, A. E., & Dudás, I. (1992). Prevention of the first occurrence of neural-tube defects by periconceptional vitamin supplementation. The New England journal of medicine. Available at: https://pubmed.ncbi.nlm.nih.gov/1307234/
4. Sloan, N. L., Jordan, E., & Winikoff, B. (2002). Effects of iron supplementation on maternal hematologic status in pregnancy. American journal of public health. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC1447059/
5. Borrelli, F., Capasso, R., Aviello, G., Pittler, M. H., & Izzo, A. A. (2005). Effectiveness and safety of ginger in the treatment of pregnancy-induced nausea and vomiting. Obstetrics and gynecology. Available at: https://pubmed.ncbi.nlm.nih.gov/15802416/
6. Bentov, Y., & Casper, R. F. (2013). The aging oocyte--can mitochondrial function be improved?. Fertility and sterility. Available at: https://pubmed.ncbi.nlm.nih.gov/23273985/
7. Bailey, R. L., West, K. P., Jr, & Black, R. E. (2015). The epidemiology of global micronutrient deficiencies. Annals of nutrition & metabolism. Available at: https://pubmed.ncbi.nlm.nih.gov/26045325/
8. Mulyani, E. Y., Hardinsyah, Briawan, D., Santoso, B. I., & Jus'at, I. (2021). Effect of dehydration during pregnancy on birth weight and length in West Jakarta. Journal of nutritional science. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC8411261/
9. Yee, L. M., Silver, R. M., Haas, D. M., Parry, S., Mercer, B. M., Iams, J., Wing, D., Parker, C. B., Reddy, U. M., Wapner, R. J., & Grobman, W. A. (2020). Quality of periconceptional dietary intake and maternal and neonatal outcomes. American journal of obstetrics and gynecology. Available at: https://pubmed.ncbi.nlm.nih.gov/31981510/

Frequently Asked Questions

Q: Can prenatal vitamins cause nausea and vomiting?

A: Yes, prenatal vitamins can cause nausea in some women, particularly due to their high iron content—a key ingredient that supports fetal development and prevents anemia during pregnancy. According to the American College of Obstetricians and Gynecologists (ACOG), iron supplements are one of the most common culprits behind prenatal vitamin-related nausea. If you experience this side effect, try taking your prenatal vitamin with food, before bedtime, or splitting the dose throughout the day. If nausea persists, consult your healthcare provider about adjusting the formulation or timing, as managing side effects helps ensure consistent nutrient intake for you and your baby.

Q: Why does prenatal vitamin iron make me feel sick?

A: Iron is essential for pregnancy—it increases your blood volume by 50% and supports fetal oxygen delivery—but it's also highly reactive in the digestive system and can irritate your stomach lining, causing nausea, constipation, or dark stools. The American Society of Reproductive Medicine (ASRM) recommends 27 mg of iron daily during pregnancy, an amount that may overwhelm sensitive stomachs, especially on an empty stomach. To reduce iron-related nausea, take your prenatal with a meal or snack, avoid taking it with calcium-rich foods (which block iron absorption), and consider spacing it several hours from other medications. Some women find relief by switching to gentler iron formulations like iron bisglycinate, which is less likely to cause gastrointestinal distress than ferrous sulfate.

Q: Should I take prenatal vitamins on an empty stomach?

A: No—taking prenatal vitamins on an empty stomach significantly increases the likelihood of nausea and digestive discomfort, especially with iron-containing formulas. The FDA doesn't regulate supplement dosing the way it does medications, so product instructions vary, but most fertility and prenatal health experts recommend taking your prenatal with a light meal or snack to improve tolerance and absorption. Pairing your vitamin with a small amount of food buffers your stomach and can reduce nausea by up to 50% according to clinical observations. If morning sickness is severe, try taking your prenatal at night with dinner instead, or ask your healthcare provider about splitting your dose into smaller amounts throughout the day.

Q: What prenatal vitamin side effects are normal versus concerning?

A: Normal prenatal vitamin side effects include mild nausea, constipation, dark-colored stools (from iron), and mild bloating—these typically improve within a few days as your body adjusts. However, severe vomiting, persistent abdominal pain, signs of an allergic reaction, or unexplained fatigue warrant immediate contact with your healthcare provider, as these may indicate an underlying condition unrelated to the supplement. The American Pregnancy Association notes that while prenatal nausea is common, severe side effects are not typical and should be evaluated professionally. If standard prenatal vitamins cause significant discomfort, your doctor may recommend alternatives like Conceive Plus prenatal formulations, which are designed with optimized nutrient ratios and bioavailability to minimize gastrointestinal upset while supporting fertility and early pregnancy health.

Q: How long does it take for prenatal vitamin nausea to go away?

A: Most women adjust to prenatal vitamins within 3-7 days, though some may experience side effects for up to two weeks as their digestive system adapts to the increased nutrient load. Approximately 40% of women report prenatal vitamin-related nausea, but nearly 70% of those find relief through simple modifications like taking the vitamin with food or at bedtime. If nausea persists beyond two weeks, don't discontinue your prenatal without consulting your healthcare provider—instead, discuss alternatives such as different formulations, gentler iron types, or dividing your daily dose into smaller amounts. Consistent prenatal supplementation is critical since the first trimester is crucial for fetal neural development, so working with your doctor to find a tolerable option ensures you receive essential nutrients like folic acid and iron throughout your pregnancy.