This module explores the metabolism and regulation of key hormones, including thyroid hormones, estrogen, testosterone, and cortisol, and their relationship with overall endocrine health. It covers the role of essential micronutrients such as selenium, zinc, magnesium, and iodine in hormone production, conversion, and function. The module also examines oxidative stress, inflammation, gut health, and lifestyle factors that contribute to hormonal dysfunction. Emphasis is placed on a system-based clinical approach that focuses on identifying root causes through nutrition, lifestyle, metabolic health, and nutrient assessment.