When should you start taking prenatal vitamins if you're trying to conceive?

The short answer: three months before you begin trying to conceive, at minimum. The Mayo Clinic recommends starting folic acid supplementation at least three months before conception because the neural tube — which becomes the brain and spinal cord — closes by day 28 of pregnancy, often before a woman knows she is pregnant. Red blood cell folate, the marker most predictive of neural tube defect protection, takes one to three months of consistent supplementation to reach optimal levels. If you are reading this and already trying to conceive, the right time to start is today. Every day of optimal nutrition counts, and benefits continue accumulating throughout every week of pregnancy.†

Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition.

Why three months is the recommended lead time

Most women discover they are pregnant two to four weeks after conception — long after the neural tube has already begun forming. If you wait until a positive pregnancy test to start your prenatal, you have already missed the window that folate supplementation is most critical to protect.

According to a clinical review on prenatal vitamin timing, research on red blood cell folate concentrations shows that it takes approximately three to six months of consistent adequate supplementation to reach the optimal threshold associated with the lowest neural tube defect risk. Folic acid blood levels respond within days, but red blood cell folate — the measurement that matters most for neural tube protection — is slower to accumulate.

Three months also gives other key nutrients time to build. Iron stores, vitamin D levels, and choline status all take time to optimize. Starting your prenatal before conception means you are not playing catch-up once pregnancy begins.

What nutrients matter most before conception

Folate (as methylated 5-MTHF)

Folate supports healthy fetal neural tube development and is the single most time-sensitive nutrient in preconception supplementation.† The methylated form — 5-MTHF — is the bioavailable form the body uses directly, without requiring conversion. It is the preferred form for all women, and particularly for those with MTHFR gene variants that may reduce folic acid conversion efficiency.†

Iron

Pregnancy significantly increases blood volume, which demands more iron. Women who enter pregnancy with low iron stores face compounded depletion as the fetus draws iron from maternal reserves. Building iron status before conception reduces this risk.† Iron bisglycinate chelate — the form used in Pink Stork Total Prenatal — is specifically formulated to be gentler on digestion than ferrous sulfate, which matters for first-trimester tolerability.†

Choline

The NIH Office of Dietary Supplements notes that most pregnant women do not meet the 450 mg adequate intake for choline, and that fewer than half of prenatal vitamins on the U.S. market contain any choline at all. Choline supports neural tube formation and fetal brain development alongside folate.† Starting a choline-containing prenatal before conception helps build stores before they are needed most.†

Vitamin D

Vitamin D supports maternal bone health and immune function during pregnancy.† Many women are vitamin D insufficient before pregnancy without knowing it, particularly in northern latitudes or with limited sun exposure. A preconception blood test for vitamin D status is a practical step many OBs recommend at a preconception visit.

"One of the challenges in pregnancy is building that trust… and feeling heard."

— Dr. Tosin Odunsi, MD, MPH, FACOG, Obstetrics and Gynecology Physician

Pink Stork Total Prenatal: designed for preconception through breastfeeding

Total Prenatal, designed for preconception through breastfeeding, delivers all of these nutrients in a single daily formula. The 22-nutrient blend includes methylated folate as 5-MTHF, iron bisglycinate chelate (Ferrochel), choline, vitamin D3 as VegD3 organic algal cholecalciferol, methylcobalamin B12, and pyridoxal-5-phosphate B6 — with ScentCert technology to reduce the scent-triggered nausea that many women experience with prenatal vitamins in the first trimester.

Total Prenatal is third-party tested at ISO 17025 accredited laboratories, cGMP-certified, non-GMO, and gluten-free. It is available at Target, Walmart, and CVS, with over 50,000 verified Amazon reviews across the Pink Stork brand. Pink Stork is a woman-founded, woman-led company.

What to do if you're already pregnant and haven't started yet

Start today. The benefits of prenatal supplementation do not end after the first trimester. Iron continues to be needed as blood volume expands in the second trimester. DHA supports fetal brain and eye development in the third trimester. Choline, vitamin D, and B vitamins remain important throughout. Late is not the same as never — every week of consistent prenatal supplementation during pregnancy supports your health and your baby's development.†

"Empowering women at every stage of their journey. Whether you're just starting to think about getting pregnant or already in your third trimester, it's never the wrong time to invest in your foundation."

— Amy Suzanne Upchurch, Founder and CEO of Pink Stork

Practical steps to take today

• Start a quality prenatal vitamin with methylated folate (5-MTHF) and chelated iron immediately if you are TTC or plan to conceive in the next year
• Schedule a preconception visit with your OB or midwife to discuss your individual nutrient status, iron levels, and vitamin D
• Review your prenatal label for choline — most prenatals do not include it at meaningful doses
• Stop hormonal birth control at least one to three months before your planned TTC start date, and begin your prenatal at the same time

For more on what to look for in a prenatal, see our guide on the best prenatal vitamin for women with MTHFR. For a deeper look at choline specifically, see how much choline you need in a prenatal vitamin. And for first-trimester tolerability tips, see which prenatal vitamins are easiest on your stomach in the first trimester.

Frequently asked questions

When should I start taking prenatal vitamins if I'm trying to conceive?

Three months before you begin trying to conceive is the recommended lead time. This allows red blood cell folate — the marker most predictive of neural tube defect protection — to reach optimal levels before the neural tube begins forming at day 28 of pregnancy. If you are already trying, start today.†

Can I take prenatal vitamins while on birth control?

Yes. Starting your prenatal while still using hormonal birth control is a practical way to build the habit and nutrient stores before your planned TTC start date. Consult your healthcare provider about your full supplement routine.

Is it too late to start prenatal vitamins after a positive pregnancy test?

No. Starting at a positive test is better than not starting at all. Prenatal vitamins provide meaningful nutritional support throughout every trimester and into breastfeeding — even if the first neural tube protection window has passed.†

Do prenatal vitamins help you get pregnant faster?

Prenatal vitamins are not fertility treatments and do not claim to increase the rate of conception. They are designed to optimize your nutritional foundation so that when conception occurs, your body has the nutrients needed to support healthy early fetal development.†

How long should I take prenatal vitamins after pregnancy?

ACOG recommends continuing prenatal supplementation through at least six months of breastfeeding. Many providers suggest continuing through the full breastfeeding period and into the postpartum recovery phase. If you plan to conceive again within a year, continuing your prenatal is particularly practical.†

What if I forget to take my prenatal vitamin?

Take it when you remember. Consistency over weeks and months matters more than perfect daily timing. Most prenatal vitamins can be taken with food to reduce any stomach sensitivity, and with a full glass of water.†

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.