This module covers female reproductive endocrinology and the role of the Hypothalamic-Pituitary-Ovarian (HPO) axis in regulating the menstrual cycle and ovulation. It explores hormonal changes in PCOS, including altered GnRH, FSH, LH, androgen, progesterone, and AMH patterns. The module also discusses different PCOS phenotypes and their metabolic, inflammatory, adrenal, and thyroid-related factors. It further introduces nutritional planning principles focused on metabolic health, antioxidants, protein, and key micronutrients.