Pregnancy Supplements: Complete Guide
Walk down the supplements aisle while pregnant and it's easy to feel like you need a dozen different bottles. In reality, NHS guidance keeps the essentials simple: two supplements matter for almost everyone, a few more are worth considering, and several popular ones are best avoided altogether.
The two essentials
- Folic acid: 400mcg daily, ideally started before conception and continued until the end of week 12. If you have a higher risk of neural tube defects (for example, a family history, diabetes, or you're taking certain medications), your GP may prescribe a much higher 5mg dose instead — this needs a prescription, not an over-the-counter tablet.
- Vitamin D: 10mcg daily throughout pregnancy and while breastfeeding. Because it's hard to get enough from diet and UK sunlight alone, this is recommended for everyone, not just those with a known deficiency.
Worth considering
- A pregnancy multivitamin designed specifically for pregnancy can be a convenient way to cover folic acid, vitamin D, and other nutrients in one tablet — check the label to confirm doses match current guidance rather than assuming.
- Healthy Start vitamins: if you're eligible for the Healthy Start scheme, free vitamins containing folic acid, vitamin D, and vitamin C are available — ask your midwife or health visitor how to apply.
- Iron: only recommended if a blood test shows you're deficient. Routine iron supplementation isn't needed for everyone and can cause uncomfortable side effects like constipation, so it's not a "just in case" addition.
Supplements to avoid
- High-dose vitamin A (retinol): excess vitamin A is linked to birth defects, so avoid supplements or multivitamins containing retinol, and check labels carefully.
- Cod liver oil: commonly high in vitamin A, so it's best avoided in pregnancy even though it's a popular general health supplement.
- Unregulated herbal supplements: many haven't been tested for safety in pregnancy, so it's worth checking with your midwife or pharmacist before taking anything marketed as "natural."
- Stacking multiple products: taking a multivitamin plus several individual supplements can lead to accidentally exceeding safe upper limits for some nutrients — more isn't automatically better.
Frequently Asked Questions
Do I need pregnancy vitamins?
The two supplements recommended for almost everyone are folic acid (400mcg daily until week 12) and vitamin D (10mcg daily throughout pregnancy). A pregnancy multivitamin can cover both alongside other nutrients, but check the dosing on the label matches current guidance.
Which pregnancy vitamin is best?
There isn't one single "best" brand — what matters is that it provides the right doses of folic acid and vitamin D and doesn't contain retinol (vitamin A). If you're eligible, free Healthy Start vitamins cover the essentials at no cost.
Can I take iron supplements just to be safe during pregnancy?
Routine iron supplementation isn't recommended unless a blood test shows you're actually deficient, as it can cause side effects like constipation. Your midwife will check your iron levels at routine blood tests and advise you if a supplement is needed.
This article is for informational purposes only and does not constitute medical advice.
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