Minerals and the Menstrual Cycle: Impacts on Ovulation and Endometrial Health An Overview of the Impact of the Menstrual Cycle on Nutrient Metabolism: An Integrative Perspective Vitamin D deficiency and female infertility: A mechanism review examining the role of vitamin D in ovulatory dysfunction as a symptom of polycystic ovary syndrome ScienceDirect The story behind PCOS Whole Family Health Thyroid Disease and Menstrual Abnormalities Providence Endocrine & Diabetes Specialty Centre Irregular periods? Hair thinning? Feeling a little off lately? Your hormones might be trying to tell you something. Hormone imbalances in women like polycystic ovary syndrome (PCOS) are common.