Calculate Your Prenatal Vitamin Dosage
Your Prenatal Vitamin Result (FDA/ACOG Standards)
FDA/ACOG Recommended Prenatal Vitamin Dosages
| Nutrient | Preconception | 1st-3rd Trimester | Breastfeeding | Overdose Risk |
|---|---|---|---|---|
| Folic Acid (Folate) | 400–800 μg | 600–800 μg | 500 μg | ＞1000 μg (mask B12 deficiency) |
| Iron | 18 mg | 27 mg | 9–10 mg | ＞45 mg (constipation/liver damage) |
| DHA (Omega-3) | 200 mg | 200–300 mg | 300 mg | ＞1000 mg (bleeding risk) |
| Calcium | 1000 mg | 1000 mg | 1300 mg | ＞2500 mg (kidney stones) |
| Vitamin A (Retinol) | 770 μg | 770 μg | 1300 μg | ＞3000 μg (fetal birth defects) |
| Vitamin B12 | 2.6 μg | 2.6 μg | 2.8 μg | Low risk (water-soluble) |
Frequently Asked Prenatal Vitamin Questions
Why is folic acid critical before conception?
Folic acid reduces the risk of neural tube defects (e.g., spina bifida) by up to 70%. The neural tube forms in the first 3-4 weeks of pregnancy, often before a woman knows she's pregnant.
Do vegan/vegetarian moms need extra vitamins?
Yes – vegan/vegetarian pregnant women need additional vitamin B12 (no plant-based sources), iron (plant iron is less absorbable), and omega-3s (ALA to DHA conversion is low).
Can too much iron harm my pregnancy?
Excess iron (over 45mg/day) can cause severe constipation, nausea, and in rare cases, liver damage. It may also reduce absorption of zinc and calcium.
What are food sources of prenatal nutrients (to reduce supplements)?
Folate: leafy greens, fortified cereals; Iron: red meat, lentils (pair with vitamin C for absorption); DHA: salmon, chia seeds; Calcium: dairy, fortified plant milk, kale.
Should I take a prenatal vitamin if I'm breastfeeding?
ACOG recommends continuing prenatal vitamins while breastfeeding to support maternal nutrient stores and ensure adequate nutrient transfer to breast milk.