Women who are not pregnant take prenatal vitamins because of unproven claims that they help hair grow faster and thicker. There is no scientific proof to suggest that taking prenatal vitamins can help hair grow. Thicker, shinier hair in most pregnant women may be attributed to elevated estrogen levels and other changing hormones during pregnancy.
Taking prenatal vitamins when you’re not pregnant can have side effects. Higher iron doses in prenatals can lead to constipation and nausea. The high dose of folic acid in prenatal vitamins may make it difficult to diagnose symptoms of vitamin B12 deficiency, which if left untreated can lead to anemia, and nerve and brain damage.