PLOD1 and polycystic ovary syndrome: Interestingly, the research has indicated two PCOS subtypes: (i) a reproductive group (21–23%), characterized by higher levels of LH and SHBG as well as relatively low BMI and insulin levels; (ii) a metabolic group (37–39%), described by higher BMI, glucose, and insulin levels, accompanied by lower LH and SHBG levels [31].