Heavy metals such as lead, mercury, arsenic, and cadmium are persistent environmental toxins that accumulate in the body over time. They can impair mitochondrial function, damage the nervous system, and disrupt hormones. Exposure may occur through water, dental fillings, food, cosmetics, or industrial environments. Functional medicine identifies heavy metal burden using targeted testing and supports detoxification with nutrients, binders, and gentle drainage strategies. Clearing metals can improve cognition, mood, energy, and overall resilience—especially in patients with unexplained symptoms or chronic conditions.