The best prenatal vitamins for pregnancy are those that contain folic acid (or folate), iron, vitamin D, and DHA, because these nutrients support baby’s brain, spine, blood, and bone development. Doctors usually recommend 400–800 mcg of folic acid daily before and during early pregnancy, and about 600 mcg during pregnancy, since it helps prevent neural tube defects and supports healthy cell growth. The difference is that folate is the natural form found in foods (like leafy greens and beans), while folic acid is the synthetic, more stable form used in supplements and fortified foods, and both provide vitamin B9 but folic acid is more reliably absorbed for pregnancy needs. Good prenatal vitamins include a balance of iron (for anemia prevention), DHA (for brain development), and vitamin D (for bones and immunity), along with folate, and the best choice depends on whether you need basic support (standard prenatal) or advanced formulas with added DHA and higher iron based on your doctor’s advice.