Vitamin B9 · The Neural-Tube Nutrient
The single strongest case in prenatal nutrition: starting before conception cuts the risk of neural tube defects by roughly half.
The Prenatal & Maternal Library
Maternal Health
What to take, what to avoid and what the evidence says, across pregnancy and after.
27 entries, ordered below with the best evidenced first.
What the evidence looks like across all 27 entries
Most of this library rests on human evidence.
| Grade | entries |
|---|---|
| 5Settled | 2 |
| 4Strong | 3 |
| 3Mixed | 14 |
| 2Thin | 8 |
| 1Untested | 0 |
5 entries rest on strong human evidence. 8 rest on little or none. How we grade evidence.
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How Your Body Changes After Pregnancy
Evidence grade 5 of 5, Settled. Read how the Atlas grades evidence.The Fourth Trimester and the Years After It
The body does not snap back at six weeks. Recovery from pregnancy is a chronological arc that runs from the first afterpains through lactation and weaning and into changes that last years, some of which never fully reverse.
A World Map of Who Adds It to the Food
Whether a country adds folic acid to its food supply changes neural-tube-defect rates at the population level, and the world is split on whether to do it.
Listeria, Raw Foods, and What to Skip
Not a nutrient question but a contamination one: pregnancy raises the risk from certain foodborne pathogens, especially Listeria, enough to change what is safe to eat.
Multiple Micronutrient Supplements
Evidence grade 4 of 5, Strong. Read how the Atlas grades evidence.The Global Shift from Iron-Folate Alone
In much of the world the prenatal question is not which boutique formula, but whether to give multiple micronutrients at all instead of just iron and folic acid.
Bone Mineral and Preeclampsia Shield
A bone mineral most people fall short on, and one of the few supplements with strong trial evidence for lowering preeclampsia risk where dietary calcium is low.
The Fetal Brain and Preterm-Birth Fatty Acid
A fatty acid that builds the fetal brain and eye and, in good trials, lowers the risk of preterm birth, with a real twist about who actually benefits.
The Nutrient and the Contaminant in One Food
The same food that is the best natural source of DHA also carries mercury, and fear of the contaminant has driven many pregnant people to underconsume the nutrient.
When the Diet Becomes the Treatment
In gestational diabetes, nutrition is not a supplement question but the first-line treatment itself, and most cases are managed by diet alone.
The Thyroid and Brain-Development Mineral
Iodine builds thyroid hormones that steer fetal brain development, and need rises in pregnancy, yet many prenatal supplements still leave it out.
The Oxygen-Carrying Mineral
Pregnancy roughly doubles iron demand to build maternal blood volume and supply the growing fetus, and deficiency is the most common nutritional shortfall in pregnancy worldwide.
Alcohol, Excess Caffeine, and High-Risk Herbs
The short, well-evidenced list of things to keep out of a pregnancy, where the guidance is unusually clear.
The Window That Closes Before You Know
The most consequential prenatal nutrition often has to happen before pregnancy is even known, which is why preconception is its own subject.
Five Places, Five Different Answers
A side-by-side of how the US, UK, EU, Japan, and lower-income regions actually approach prenatal nutrition differently.
How Prenatal Guidance Differs by Region
The advice a pregnant person gets depends heavily on where they live, and the differences between the US, Europe, the UK, and the wider world are larger than most people realize.
Essential, and the One to Watch the Ceiling On
A nutrient pregnancy genuinely needs, and the clearest example of a vitamin where too much, in the wrong form, causes serious birth defects.
The First-Line Answer to Morning Sickness
The evidence-based first step for nausea and vomiting of pregnancy, recommended by ACOG, alone or paired with doxylamine.
The Preeclampsia Hypothesis That Failed
A compelling theory, that antioxidants prevent preeclampsia, that large trials tested thoroughly and found not only useless but, at high doses, possibly harmful.
How Much "Eating for Two" Really Means
"Eating for two" is one of the most persistent prenatal myths; the actual extra energy need is modest and weight-gain targets depend on starting weight.
The Overlooked Brain-Building Nutrient
A nutrient most prenatal vitamins skip, that the vast majority of pregnant people fall short on, and that supports the same brain and spinal-cord development as folate.
The Herbal Tea Aisle, Sorted by Evidence
The pregnancy-tea aisle ranges from genuinely evidence-backed (ginger) to traditional-but-unproven to better avoided, and the labels rarely tell you which is which.
Cramps, Calm, and Cautious Evidence
Widely taken for leg cramps and sleep, often below the recommended intake to begin with, but the routine-supplementation evidence is thinner than the popularity suggests.
The Fourth Trimester Nobody Supplements For
Pregnancy and breastfeeding draw down a mother's nutrient stores for months, and the recovery period is the one most prenatal advice ignores.
The Nutrient Plant-Based Diets Must Plan For
Works hand in hand with folate, matters most for those eating little or no animal food, and is one nutrient a plant-based pregnancy genuinely has to plan around.
The Contested Sunshine Vitamin
A nutrient everyone agrees matters, where the experts genuinely disagree on how much, what blood level to aim for, and whether to screen at all.
Reading the Label Behind the Marketing
Prenatal vitamins are not standardized or pre-tested, and the gaps between brands, missing choline, low calcium, token iodine, are exactly what the label ghostwrites past.
The Quiet Mineral of Growth and Repair
Essential for growth, immunity, and healing, with a small and weakly recommended effect on preterm birth, and a real depletion problem after delivery.
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