Pregnancy Nutrients
Pregnancy Nutrients
Pregnancy dramatically increases the body's demand for specific nutrients. Getting the right nutrition — from both food and supplements — supports fetal development, reduces the risk of complications, and protects maternal health. This guide covers the most important nutrients for each stage of pregnancy.
Critical nutrients throughout pregnancy
Folate / Methylfolate
Folate is essential for DNA synthesis and neural tube closure, which occurs by week 6 of pregnancy — often before a woman knows she is pregnant. This is why supplementation should begin at least 3 months before conception.
Recommended dose: 400–800mcg daily. Women with the MTHFR gene variant should use methylfolate (5-MTHF) rather than synthetic folic acid.
Food sources: Dark leafy greens, lentils, chickpeas, asparagus, avocado.
Vitamin D3
Vitamin D supports fetal bone development, immune function, and reduces the risk of gestational diabetes and pre-eclampsia. Most UK women are deficient, particularly in winter.
Recommended dose: 1,000–2,000 IU daily throughout pregnancy. Test levels if possible.
DHA (Omega-3)
DHA is the primary structural fat in the fetal brain and retina. It accumulates rapidly in the third trimester. Adequate maternal DHA is associated with better cognitive and visual outcomes in children.
Recommended dose: 200–300mg DHA daily. Choose algae-based DHA if avoiding fish.
Iodine
Essential for thyroid hormone production, which regulates fetal neurological development. Iodine deficiency during pregnancy is associated with lower IQ and developmental delays. Many prenatal supplements do not contain adequate iodine.
Recommended dose: 150–220mcg daily during pregnancy.
Choline
Choline is critical for fetal brain development, particularly the hippocampus (memory centre). It is frequently under-supplemented and under-consumed. Eggs are the richest dietary source.
Recommended dose: 450mg daily during pregnancy.
Iron
Blood volume increases by up to 50% during pregnancy, significantly increasing iron requirements. Iron deficiency anaemia is the most common nutritional deficiency in pregnancy.
Recommended dose: 27mg daily during pregnancy. Test ferritin levels and supplement accordingly.
Food sources: Red meat, lentils, spinach, fortified cereals. Pair with vitamin C to enhance absorption; avoid with calcium or tea.
Calcium
Fetal bone mineralisation accelerates in the second and third trimesters. If maternal calcium intake is insufficient, the fetus draws calcium from maternal bones.
Recommended dose: 1,000mg daily from food and supplements combined.
Vitamin K2
Works with vitamin D to direct calcium into bones rather than soft tissue. Supports fetal bone mineralisation in the third trimester.
Magnesium
Supports muscle function, sleep quality, and may reduce the risk of leg cramps and preterm labour. Many women are deficient.
Recommended dose: 300–400mg daily. Magnesium glycinate is the best-tolerated form.
B Vitamins (B6, B12, B2)
B6 may reduce nausea in the first trimester. B12 is essential for neurological development and is particularly important for women following plant-based diets. B2 (riboflavin) supports energy metabolism.
What to look for in a prenatal supplement
A high-quality prenatal supplement should contain:
- Methylfolate (not just folic acid)
- Vitamin D3 (not D2)
- DHA from algae or fish oil
- Iodine (often missing from cheaper supplements)
- Choline
- Iron (in a gentle, well-absorbed form)
- B12 as methylcobalamin
Avoid: High-dose vitamin A (retinol) — can be teratogenic above 3,000mcg RAE daily.
Frequently asked questions
Can I get all these nutrients from food alone?
In theory, yes — but in practice, meeting requirements for folate, DHA, iodine, vitamin D, and choline through diet alone is very difficult. A quality prenatal supplement fills these gaps reliably.
When should I start taking prenatal vitamins?
Ideally 3 months before trying to conceive. If you find out you are pregnant, start immediately.