Metformin is an oral medication commonly used in hormone replacement therapy and for managing insulin resistance. It works by improving insulin sensitivity, reducing glucose production in the liver, and enhancing glucose uptake in tissues. This helps to regulate blood sugar levels, making it particularly beneficial for individuals with polycystic ovary syndrome (PCOS) and those undergoing hormone replacement therapy who may experience insulin resistance. Metformin supports metabolic health, aids in weight management, and can improve overall hormonal balance, contributing to better health outcomes for patients with insulin resistance or metabolic disorders.