Vitamins For Woman

Pregnancy Vitamins to Avoid: What Not to Take During Pregnancy

margaret etudo

Medically Reviewed By Margaret Etudo. Written By The Vitamins For Woman Team.

A healthy pregnancy saves you a lot of hassle and the first step towards a healthy pregnancy are your vitamins. Not every vitamin is right for your pregnancy so  what vitamins and supplements should you avoid during your pregnancy?

pregnancy vitamins to avoid

Table of Contents

Introduction

Pregnancy is an important time for both you and your baby, making it necessary to maintain a healthy diet and supplement routine. Most vitamins and supplements play a big role in supporting your pregnancy, but not all of them are safe. Some vitamins and supplements can harm fetal development, cause birth defects, and even lead to pregnancy complications.

Understanding which vitamins to avoid and why they are unsafe can save an expecting mother and her baby. In this article, we will explore the pregnancy vitamins to avoid while pregnant, safer alternatives, and how to choose safe prenatal vitamins.

Why Are Some Vitamins Unsafe During Pregnancy?

Most of these vitamins are safe to take way before your pregnancy as they’re wonderful for overall health, but should be avoided if and when you get pregnant. Here are some key reasons why some vitamins and supplements should be avoided:

  • Risk of Birth Defects: High doses of certain vitamins, such as Vitamin A (retinol), have been linked to congenital disabilities and developmental issues in babies.
  • Toxicity and Overdose: Most fat-soluble vitamins, like vitamins A and E, can build up in the body and lead to toxicity, which is dangerous for both you and your baby.
  • Interference with Pregnancy Hormones: Some supplements, especially herbal products, may interfere with pregnancy hormones, leading to complications such as preterm labour or miscarriage.
  • Unregulated Supplements: Many herbal and dietary supplements are not FDA-approved and may contain harmful contaminants or unknown ingredients. A typical one is ephedra, which is a supplement used in weight loss supplements. It increases heart rate and can cause death.

 

So that you can rest easy at night knowing that your baby is healthy, safe and strong and that you are not at risk of a pregnancy complication, please avoid the 5 supplements to be mentioned.

 

Top 5 supplements and pregnancy vitamins to avoid

We’ve seen why these supplements are not advisable for pregnant women and should be avoided throughout your pregnancy and even breastfeeding. Here are 5 supplements to avoid while pregnant: 

Vitamin A (Retinol)

Vitamin A is crucial for fetal development, but excessive amounts—especially in the form of retinol—can cause serious birth defects and liver toxicity. Pregnant women should not exceed 10,000 IU of Vitamin A per day.

Herbal Supplements

Many herbal supplements have not been tested for pregnancy safety and can trigger hormonal imbalances, contractions, or even miscarriages. Common herbs to avoid are black cohosh, which may cause uterine contractions, and fenugreek, which can induce labour.

High Doses of Vitamin E

Vitamin E is essential for immune function, but excessive intake (above 400 IU per day) has been linked to increased risks of premature rupture of membranes (PROM) and pregnancy complications. The recommended daily intake for pregnant women is 15 mg (22.4 IU).

Excessive Iron

Iron is incredibly important during pregnancy, but excessive amounts can cause constipation, nausea, vomiting, and iron toxicity in severe cases. Pregnant women typically need 27 mg of iron per day. Over 45 mg per day may lead to toxicity and gastrointestinal issues.

Unregulated or Unapproved Supplements

Many supplements, including weight loss pills, detox teas, and bodybuilding supplements, are not regulated by the FDA and may contain harmful chemicals or high doses of certain nutrients. Examples of supplements to avoid are detox teas, which can cause dehydration and affect pregnancy nutrients, and weight loss supplements, which may contain stimulants unsafe for pregnancy.

Vitamins A and E are fat-soluble vitamins and are normally stored within our bodies, so excessive intake of these vitamins could potentially lead to toxicity. There you have it, 5 pregnancy vitamins to avoid if you’re considering pregnancy or you’re already pregnant.

Safe Alternatives to Unsafe Vitamins

If you need to supplement your diet during pregnancy, here are safe alternatives to the risky vitamins mentioned above,

  1. Instead of retinol-based Vitamin A, you could go for beta-carotene, which is found in natural sources like carrots, spinach, and sweet potatoes. Beta-carotene is converted into Vitamin A by the body but does not pose the same risk of toxicity.
  2. Instead of herbal supplements, choose doctor-approved prenatal vitamins that contain essential nutrients in safe amounts. If you still need these natural remedies, consult your healthcare provider before taking any herbal products.
  3. Instead of high-dose Vitamin E supplements, get Vitamin E naturally from foods like nuts, seeds, and spinach. These sources provide a balanced amount without the risk of excessive intake.
  4. Instead of excessive iron supplements, you could try getting a balanced intake of iron-rich foods like lean meats, beans, and leafy greens. If you still need additional supplementation, choose a prenatal vitamin with controlled iron levels to avoid toxicity. Ask your doctor first they’ll be able to recommend one for you.
  5. Instead of unregulated or unapproved supplements, stick to FDA-approved prenatal vitamins or those that have undergone third-party testing. This ensures safety and efficacy while avoiding harmful additives. 

These alternatives provide all the necessary vitamins for a healthy pregnancy without having a toxic effect on your body. Your body and your baby will thank you.

 

Tips for Choosing Safe Prenatal Vitamins

The best thing you can do for yourself during your pregnancy is to choose the right prenatal vitamins. You’ll get more nutrients, and your baby’s healthy development is assured. Here’s how to ensure you’re getting a safe and effective supplement:

  • Look for FDA-Approved or Third-Party Tested Supplements: Avoid unregulated products with unknown ingredients.
  • Avoid Harmful Additives: Stay away from artificial colours, sweeteners, or unnecessary fillers when picking a prenatal vitamin. 
  • Check Nutrient Levels: Ensure the vitamin includes Folic Acid (400-800 mcg), Iron (27 mg), Calcium (1,000 mg) and DHA & Omega-3s.
  • Consult Your Doctor: Always check with your healthcare provider before starting any supplement.

Frequently Asked Questions

Most herbal supplements are not recommended during pregnancy due to a lack of research on their safety. Some herbs may cause miscarriage, preterm labour, or fetal harm. Always consult a doctor before taking herbal remedies.

 

No, regular multivitamins are not designed for pregnancy and may contain unsafe levels of Vitamin A, Vitamin E, or other nutrients. Instead, take a prenatal vitamin specifically formulated for pregnancy.

 

  • Instead of retinol-based Vitamin A, choose beta-carotene from food sources.
  • Instead of high-dose Vitamin E, get it naturally from nuts and seeds.
  • Instead of herbal supplements, rely on doctor-approved prenatal vitamins.

Final Thoughts for You

Finding the right vitamins and supplements can really help you enjoy a healthy pregnancy and ease some of that stress. However, it’s important to be careful as some can pose risks to both your health and your baby’s. 

To keep things safe, steer clear of high doses of Vitamin A, herbal supplements, too much Vitamin E, excessive iron, and anything that hasn’t been approved. Instead, opt for prenatal vitamins that your doctor recommends, focus on a well-balanced diet, and always check in with your healthcare provider before adding any new supplements to your routine.

Making thoughtful choices will make for a happy and healthy pregnancy for both you and your baby.

 

  1. Nutrition During Pregnancy [WWW Document], n.d. URL https://www.acog.org/womens-health/faqs/nutrition-during-pregnancy (accessed 3.16.25).
  2. Prenatal vitamins: Why they matter, how to choose [WWW Document], n.d. . mayo Clinic. URL https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/prenatal-vitamins/art-20046945 (accessed 3.16.25).
  3. EPHEDRA: Overview, Uses, Side Effects, Precautions, Interactions, Dosing and Reviews [WWW Document], n.d. URL https://www.webmd.com/vitamins/ai/ingredientmono-847/ephedra (accessed 3.16.25).
  4. Laelago, T., 2018. Herbal Medicine Use during Pregnancy: Benefits and Untoward Effects. IntechOpen.
margaret etudo

medically reviewed by margaret etudo, BPharm. written by the vitamins for woman team.

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