When you become pregnant, your baby gets all the nutrients it needs directly from you, so it’s easy to become deficient in key vitamins and minerals. During pregnancy your body is undergoing dramatic adjustments – aside from hormonal changes, blood volume increases by more than 40% through pregnancy and oxygen demand increases by up to 30%. To allow for these adjustments, your nutritional requirements increase significantly. Supplementing a prenatal multivitamin before trying to conceive can help to build up your stores of nutrients like folate, iron and iodine – not only aiding in preconception health but also supporting micronutrient needs when demands increase during pregnancy.