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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 refects 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 prescripton 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.
^ a b "Position of The American Dietetic Association: Nutrition and Lifestyle for a Healthy Pregnancy Outcome - American Dietetic Association". http://www.adajournal.org/article/PIIS0002822302903275/fulltext.
^ "Prenatal vitamins: OK for women who aren't pregnant? - MayoClinic.com". http://www.mayoclinic.com/health/prenatal-vitamins/AN01665. Retrieved 2008-01-01.
^ "Compliance with prenatal vitamins". http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1783699. Retrieved 2008-01-01.
^ "Prenatal Vitamins". http://www.clevelandclinic.org/health/health-info/docs/2800/2801.asp?index=9754.
^ "Vitamins and Minerals - March of Dimes". http://www.marchofdimes.com/pnhec/159_514.asp. Retrieved 2008-01-01.
^ "Ther- Rx". http://www.ther-rx.com/.
^ "Prenatal Vitamin Soft Chew". http://www.bloomennutrition.com/.