When Should You Start a Prenatal Vitamin? Why 3+ Months Before Pregnancy Matters
If you’re thinking about trying for a baby, you’ve probably heard that you should start a prenatal vitamin. But when should you actually start taking one?
Not when you see two pink lines.
Not even when you start trying actively.
Ideally, at least 3 months before conception and even better, 6-12 months beforehand.
Here’s why.
Why Starting a Prenatal Vitamin Before Pregnancy Is So Important
Starting a prenatal vitamin before pregnancy is part of your pre-pregnancy health optimisation to help you prepare to be a healthy future parent!
A prenatal multivitamin can support the following
- Build sufficient nutrient stores & reduce the risk of deficiencies early in pregnancy
- Support healthy egg development which starts 90-120 days before you ovulate that egg!
- Reduce the risk of neural tube defects by increasing folate levels in the body
- Support placental development and early embryo growth
- Influence your child’s long-term health and development, alongside a healthy diet & exercise
You don’t want to be behind the eight ball nutritionally once you fall pregnant and playing catch-up whilst you may be feeling nauseous and not interested in your usual foods!
Let’s unpack that.
1. Build Sufficient Nutrient Stores
Many nutrients, like iron, iodine and vitamin D, take time to build up in the body.
Even if you feel like you eat well, it can be challenging to consistently meet all of your pregnancy nutrient requirements. In fact, a recent study found that 0% of pregnant women met the recommended intake across all five food groups – yet 61% believed their diet during pregnancy was healthy. That is a stark contrast between reality and beliefs of participants!
If you enter pregnancy already depleted, it’s much harder to “catch up” once demands increase in the first trimester. Not to mention that 80% of pregnant women experience nausea and/or vomiting and associated food aversions which can make eating a nutritionally balanced diet a lot more challenging in practicality, despite all good intentions!
Starting early with a great diet before conception supported by a prenatal multivitamin allows you to build strong foundations before your requirements rise.
2. Support Egg and Sperm Development
The egg you ovulate this month has been maturing for approximately 90-120 days beforehand.
During this time, nutrients influence:
- Mitochondrial function (energy production inside the egg)
- DNA integrity
- Cellular development
That’s why the 90 days before conception are so important for egg quality.
Get our FREE IVF Essentials Audio Guide from our founder, Stefanie Valakas APD, award-winning fertility dietitian & nutritionist stepping you through the nutrition changes from egg collection, sperm health to implantation & the two week wait. Access the audio guide here.
Equally as important to know is that a full sperm cycle takes approximately 74 days.
What your partner eats, drinks and supplements with during this time can influence:
- Sperm count
- Motility
- Morphology
- DNA fragmentation
Preconception nutrition isn’t just about preparing for pregnancy – it’s about optimising egg and sperm health at a cellular level to support a healthy pregnancy and baby.
Learn more about How to Choose a Male Preconception Vitamin.
3. Reduce the Risk of Neural Tube Defects
Folate is critical in the earliest weeks of pregnancy, when the neural tube is forming. The neural tube is your baby’s future brain and spinal cord, essential structures for their development.
The neural tube closes very early in pregnancy, finishing up around 5 weeks – often before some even know that they are pregnant and hence why starting a prenatal with folic acid is so important!
Starting folic acid before conception significantly reduces the risk of neural tube defects, including spina bifida.
In fact, it’s so critical that in 2009 the Australian government intervened and mandated that all bread flour is fortified with folic acid to help improve the folate status of Australian women who may unknowingly become pregnant, this was shown to be an effective public health measure to reduce the risk of neural tube defects.
4. Support Healthy Placental Development and Early Embryo Growth
The earliest placental cells being to form early in pregnancy – often before you know you’re pregnant. It is responsible for delivering oxygen and nutrients to your developing baby and supporting hormone production throughout your entire pregnancy, all 40+ weeks of it!
Adequate intake of key nutrients supports normal placental and embryonic development in early pregnancy.
Starting a prenatal supplement before conception helps ensure these nutrients are available during this critical window.
5. Influence Your Child’s Long-Term Health and Development
Emerging research shows that nutrition before and during pregnancy can influence a child’s long-term health – including brain development, immune function and even future disease risk.
Studies have shown that inadequate nutrition can impact a newborn’s birth weight, where both lower and higher than average birth weights are associated with later disease risk (Davies et al., 2016).
On the other hand, another recent study showed that supplementing with 930 mg/day of choline was associated with improved sustained attention in children at age 7.
Learn more about the importance of choline during pregnancy for your child’s cognitive development
So nutrition doesn’t just play a role in preventing the development of disease – it can also actively support optimal brain development, cognitive function and long-term health outcomes.
This is where preconception nutrition shifts from being simply protective to being proactive.
The Role of Pre-conception Diet vs Supplementation
Why 6-12 Months of Preconception Nutrition Is Ideal
Starting even earlier gives us TIME to make sure we have corrected any deficiencies as well as optimised stores leading into pregnancy.
This extended window is particularly important if you are transistioning off long-term hormonal contraception such as the pill or you’re managing potentially fertility-impacting conditions such as endometriosis, adenomyosis, thyroid dysfunction or PCOS, as these may increase your requirements for certain nutrients or impact how your body absorbs and utilises them.
Want to dive deeper? Book a 30 minute virtual Express Prenatal Supplement Consult with our team of expert fertility & pregnancy dietitians who have formulated over 1000 custom plans for individuals and couples around the world.
What If You Didn’t Start a Prenatal 3 Months Before Pregnancy?
First – take a breath.
If you didn’t start a prenatal 1-3 months before conceiving, you haven’t “ruined” anything.
Start now.
While beginning earlier is ideal, starting as soon as you know you’re pregnant is still beneficial. Many of the nutrients in a prenatal vitamin continue to play an important role throughout pregnancy – not just in those first few weeks.
What Nutrients Should You Focus on 3-12 Months Before Pregnancy?
We’ve explored this in more detail in a previous blog here, some nutrients to look out for are:
- Folic acid or folate
- Iodine
- Vitamin D3
- Zinc
- Selenium
- Choline
- Vitamin B12
- B vitamin complex
Remember, a prenatal multivitamin isn’t designed to cover 100% of all your requirements of every nutrient for you… Typically, prenatal multivitamins are not particularly high in Calcium or Magnesium and some aren’t high in iron either.
That doesn’t mean it’s a “bad” vitamin, these are large nutrients that are hard to put together with other nutrients for absorption and you may need more/less compared to others, this is where personalisation and supporting supplementation may come into play!
However, it’s important to remember that nutrition is never one-size-fits-all. Your specific requirements will depend on your blood work, medical history, age, timeline and mode of conception.
Not All Prenatal Vitamins Are Created Equal
Here’s something important to understand…
Two prenatal vitamins can sit side by side on a pharmacy shelf and look almost identical, yet differ significantly in:
- Dosage
- Nutrient forms
- Bioavailability
- Levels of particular nutrients
And the “best prenatal vitamin” isn’t the most expensive one or the one with the prettiest packaging.
It’s the one that meets your individual requirements. And yes, even though you are approaching a lifestage, each person’s needs can vary wildly. For example, some people require up to 10 times the amount of folic acid than others to reduce their chances of neural tube defects.
That’s why a one-size-fits-all approach doesn’t work when it comes to prenatal supplementation.
Ready to sort out your supplement plan without the head scratching in the pharmacy aisle?
If you’re 3-12 months away from trying to conceive, this is your window.
Starting early isn’t about being extreme – it’s about being strategic.
If you’d like personalised guidance on which prenatal supplement is right for you, our Express Prenatal Supplement Consult is designed exactly for this stage.
In just 30 minutes, we’ll:
- Review your diet
- Assess relevant blood work
- Identify nutrient gaps
- Recommend a tailored prenatal plan
So you can feel confident that you’re supporting your fertility and your future baby in the best way possible. Book here to get started!
