Which vitamins matter when trying to conceive?
One is non-negotiable: folic acid, 400 micrograms daily, started at least a month before trying, cuts serious spinal birth defects dramatically. It is the single best-evidenced supplement in all of medicine for this moment.
Vitamin D if yours is low, and iodine adequacy matter; a basic prenatal vitamin covers both. Correct iron only if tests show deficiency.
Expensive fertility blends add marketing, not conception. The bigger levers remain smoking cessation for both partners, moderate weight, limited alcohol, and timing sex to the fertile window.
Source: CDC, about folic acid
What actually has evidence behind it
| Result | In short | What it means |
|---|---|---|
| Folic acid, 400 micrograms daily | Start before conceiving | The one with the strongest evidence. It prevents neural tube defects, and the tube closes by week four, often before a missed period. |
| Folic acid, 5 milligrams daily | Higher risk only | A previous affected pregnancy, diabetes, epilepsy medicines, a BMI over 30, or sickle cell disease. Prescribed, not bought. |
| Vitamin D, 10 micrograms (400 IU) daily | Widely advised | Recommended through pregnancy in most countries, and deficiency is common wherever winters are long or skin is covered. |
| Iodine, iron, B12 | Only if you are short | Worth checking on a vegan diet, after bariatric surgery, or with heavy periods. Iron without a reason causes constipation and nothing else. |
| Vitamin A as retinol, and high dose supplements | Avoid | Too much retinol harms a developing baby. Skip liver and check that any multivitamin is the pregnancy version. |
| Fertility blends and male supplements | Weak evidence | Antioxidant blends for sperm show small and inconsistent effects. Stopping smoking, cutting alcohol and treating sleep apnea do more. |
Doses here are the standard preconception amounts. Anything higher belongs to a doctor who knows your history. Check it against the guidelines.
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Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS · How we review
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