Prenatal Vitamins
Prenatal vitamins are vitamin supplements
intended to be taken before and during pregnancy and during postnatal lactation.
Although not intended to replace a healthy diet, prenatal vitamins provide women of child bearing age with nutrients recognized by the various health organizations including the American Dietetic Association as helpful to for a healthy pregnancy outcome. Prenatal vitamins are similar to other multivitamins, but do contain different amounts of specific nutrients to better suit the needs of an expecting mother. Vitamins such as folic acid, calcium and iron are in higher concentrations while nutrients such as Vitamin A are reduced to reflect the current understanding of the role that these compounds play in fetal development.
The increase dosage of folic acid or folates reflects
the American Dietetic Associations position that women should consume “400 μg per day of synthetic folic acid from fortified foods (cereals and other grains), supplements or both, in addition to consuming folate from foods in a varied diet.” Often prenatal vitamins also have a reduced dosage of vitamins that may be detrimental to the fetus when taken in high doses (such as Vitamin A). Prenatal vitamins are available both over the counter in retail stores as well as by prescription from medical professionals.
Although prescription vitamins are often covered by insurance, the relative potency of prescription-grade products are typically not significantly different than those available through retail.
Differences in prescription versus retail vitamins do however exist in consistency and quality level, as well as the relative bioavailability of some specific ingredients. For example, many prescription prenatal vitamins will contain a more bioavailable form of folate; 5-methyltetrahydrofolate (5-MTHF) also known under the brand Merck pharmaceutical brand, Metafolin.
Many women have difficulty tolerating prenatal vitamins
or experience constipation as a result of the high iron content. Due to tolerance challenges, the prenatal vitamin industry has developed a multitude of dosage forms to meet the needs and tolerances of expecting mothers.
The most common form of prenatal vitamin is the compressed tablet which is available through all channels and at various quality levels. Category leaders such as Ther-Rx utilize this as the dosage form of choice. Other organizations within the category offer products in a variety of dosage forms such as liquids, prenatal vitamin soft chews, vitamin chewables, and even jellied prenatal vitamins.
In addition to the actual vitamin, many prenatal manufacturers have chosen to include the omega-3 fatty acid, Docosahexaenoic acid (DHA) in their product, either as an ingredient in the formula, or as a complementary softgel pill. Although explicitly in many formulas to support neural development, the omega-3 fatty acids are used by both mother and fetus to create the phospholipid bilayer that makes up the cell membrane.
All pregnant women should take 4,000 international units of vitamin D daily —
10 to 20 times the dose the leaders of Canada's pregnancy specialists currently recommend — to lower their risk of preterm labour, preterm birth and infections concludes the first study to investigate the safety of high doses of vitamin D during pregnancy.
The study found that women in its 4,000-IU-a-day group had half the risk of premature delivery than women who took just 400 IU of vitamin D daily.
Premature birth is the leading cause of newborn deaths in Canada.