Periods/Menstruation in women is a natural biological function, Vitamin C has little to do with whether or not a woman menstruates. In fact, menstruation is a sign of health in women. If a woman is not pregnant and does not menstruate properly, something is horribly wrong. read more
One is a 2005 Cochrane review that examines multi-vitamin prenatal treatment as a prevention of miscarriage and stillbirth (not specifically vitamin C) and finds no relation between miscarriage and prenatal vitamin consumption. read more