Do prenatal vitamins help fertility?

Have you ever wondered whether prenatal vitamins can actually improve fertility, help regulate your cycle, or support egg quality? These are some of the most common questions we hear from women who are trying to conceive, thinking about pregnancy, or simply wanting to better understand how to support their bodies during their reproductive years.

The truth is, there is so much information out there, and not all of it is clear or helpful. It can feel overwhelming trying to piece together what nutrients matter most, what to look for in a prenatal, and how to truly support your fertility in a meaningful way.

WeNatal’s team of functional medicine registered dietitians and fertility experts believe that supporting your body starts well before pregnancy. Nutrition plays a foundational role in optimal hormone levels, egg quality, and early fetal development, and small, consistent changes can make a meaningful difference over time.

Do prenatal vitamins help fertility?

Yes. Prenatal vitamins are not only for pregnancy. They can also support fertility by providing key nutrients involved in hormone regulation, metabolic health, menstrual cycle function, and egg maturation.

Starting a prenatal vitamin three to six months before trying to conceive helps build nutrient stores that support fertilization, embryo development, and early placental formation.

Can prenatal vitamins regulate your cycle?

Prenatal vitamins are not designed to regulate your menstrual cycle on their own, but they can support the underlying nutrient status that influences cycle health. Low levels of nutrients such as vitamin D, magnesium, zinc, folate, B6, B12, iron, and iodine have been associated with irregular cycles, PMS symptoms, and disrupted ovulation. Repleting these nutrients through a high-quality prenatal may help support more consistent cycle patterns over time.

What nutrients improve egg quality?

Women are born with all of their eggs, but each egg undergoes a critical maturation process in the three to four months leading up to ovulation. This window is one of the most important opportunities to support egg quality through nutrition.

Key nutrients that support egg quality include B-vitamins (especially B12, folate, and choline) vitamin C, vitamin E, vitamin D, iron, magnesium, zinc, selenium, iodine, CoQ10, alpha lipoic acid, acetyl l-carnitine, N-Acetyl-Cysteine (NAC), Pyrroloquinoline Quinone (PQQ), and omega-3 fatty acids. 

These nutrients help support mitochondrial function, protect against oxidative stress, and promote healthy DNA synthesis, all of which are essential for optimal egg development.

What nutrients should be in a prenatal vitamin?

When choosing a prenatal vitamin, it’s important to look for one with a comprehensive range of nutrients in bioavailable forms and optimal doses. 

Some important nutrients that we want to see in a high quality prenatal include:

• Methylated B vitamins, including methylfolate and B12
• Choline for brain and nervous system development
• Antioxidants: vitamin C, vitamin E, vitamin A (with preformed retinol)
• Vitamin D and vitamin K
• Minerals such as iodine, selenium, magnesium, zinc, and iron

Supplementing with DHA omega-3s is also recommended during pregnancy, and most prenatals do not include it to ensure stability of the DHA oils as well as the potency of the other prenatal vitamins. 

Why do many prenatal vitamins not contain choline? 

Choline plays a critical role in fetal brain development, cell membrane structure, and DNA regulation, yet many prenatal vitamins do not include it. The recommended daily amount of choline in pregnancy is 450 mg/day, but less than half of prenatal supplements contain choline. 

Choline is not required to be included in prenatal vitamins, and choline takes up more space in a formula, making it more expensive and harder to include in capsule form. As a result, many prenatal supplements either omit choline entirely or include it in insufficient amounts, which is why additional supplementation or dietary intake is often encouraged.

Is methylated folate better than folic acid in prenatal vitamins?

Folic acid is a synthetic form of folate, whereas methylated folate is the active form that the body can use directly. Folic acid has traditionally been used in research and supplements because it is inexpensive and stable. However, newer research suggests that many individuals do not efficiently convert folic acid into its active form in the body.

This is especially relevant for individuals with a common genetic variation called MTHFR, which may affect an estimated 20 to 50 percent of the population. In these cases, the body has a reduced ability to convert folic acid into usable folate, meaning it may not provide the intended benefits.

In addition, when folic acid is not properly converted, it can accumulate in the bloodstream as unmetabolized folic acid, which has been associated with potential health concerns.

Why is iron important in prenatal vitamins?

Iron needs increase significantly during pregnancy due to increased blood volume and the demands of supporting a growing baby. Even before pregnancy, many women are at risk for iron deficiency due to menstruation.

A prenatal vitamin that includes iron can help support healthy oxygen transport, energy levels, and overall maternal health, especially when dietary intake is limited or symptoms like nausea make it difficult to eat iron-rich foods (beef, chicken, fish, shellfish, and dark leafy greens).

How much vitamin D should be in a prenatal vitamin?

The current general recommendation is around 600 IU per day, but this may not be enough to maintain optimal vitamin D levels during pregnancy. In practice we find that closer to 2000-4000 IU/day may be more effective at maintaining vitamin D levels in pregnant women, especially as needs can vary based on pre-pregnancy vitamin D levels, sun exposure, skin tone, and time of year.

This matters because vitamin D plays an important role in immune function, hormone levels, and fetal development. Low levels during pregnancy have been associated with increased risk of complications like miscarriage, preterm birth, gestational diabetes, preeclampsia, and neurodevelopmental challenges.

Women may benefit from checking their vitamin D levels before and throughout pregnancy, as well.

How much protein should a pregnant woman eat per day?

Protein needs increase significantly throughout pregnancy to support fetal development and maternal tissue growth. Remember, protein provides the building blocks for cells, tissues, hormones, and enzymes which makes it especially important during this time of rapid development. 

The current Recommended Daily Allowance (RDA) for protein in pregnancy is 0.8 g/kg of body weight in the first trimester and 1.1 g/kg body weight in the second and third trimesters. However, newer research suggests these amounts may underestimate true needs. More recent data suggests at least 1.2 g/kg of body weight in early pregnancy and 1.52 g/kg of body weight in later pregnancy (~36 weeks). For example, a woman who begins pregnancy at 150 pounds (about 68 kg) would likely benefit from approximately 80–100+ grams of protein per day, depending on the stage of pregnancy.

In practice, aiming for at least 90–100 grams of protein daily is a simple and effective target for most women, helping to support steady energy, balanced blood sugar, and optimal fetal development.

Is 100 grams of protein enough during pregnancy?

For many women, 100 grams of protein per day is a helpful baseline during pregnancy, but whether it is truly enough depends on individual factors such as pre-pregnancy weight, activity level, stage of pregnancy, and overall health.

Protein needs naturally increase as pregnancy progresses, with the greatest demands occurring in the second and third trimesters when fetal growth accelerates. Research suggests requirements may range from about 1.2 grams per kilogram of body weight in early pregnancy to closer to 1.5 grams per kilogram in later pregnancy, which for many women lands around or slightly above 100 grams per day.

For some, this 100 grams baseline will meet their needs well. For others, especially those who are more active, carrying multiples, or beginning pregnancy at a higher body weight, protein needs may be higher to adequately support both maternal health and fetal development.

Why is protein important for pregnancy?

Every cell in the human body contains protein, which is why it is often referred to as the building block of life. Protein is essential for creating new cells, repairing damaged tissue, maintaining and building muscle, producing hormones and enzymes, and supporting a healthy immune system.

Pregnancy is a time of rapid growth and development for both mother and baby, which makes protein especially important during this phase. Getting enough protein can also help support stable blood sugar levels and sustained energy, helping you feel more balanced, nourished, and satisfied throughout the day.

A note from WeNatal on fertility nutrition, egg quality, and nourishing your body for pregnancy

Supporting fertility and pregnancy is not about one single nutrient or supplement. It is about creating a strong foundation through consistent nourishment, thoughtful supplementation, and an understanding of what your body truly needs during this phase.

The months leading up to conception offer a powerful opportunity to support egg quality, hormone and overall reproductive health. During pregnancy, those same nutrients continue to play an essential role in supporting both maternal health and your baby’s development.

At WeNatal, we take a comprehensive approach to fertility and prenatal nutrition. Our formulas are designed by fertility experts to provide targeted, bioavailable nutrients that support egg quality, reproductive health, and healthy pregnancies.

Whether you are preparing for pregnancy, currently expecting, or focusing on your postpartum recovery, having the right nutritional support can make a meaningful difference.

You can explore WeNatal for Her and WeNatal for Him, along with targeted support like Egg Quality+, Omega DHA+, and Protein +, to help nourish your body and support your fertility journey from the very beginning.