Mitochondria are the “powerhouses” of the cell, responsible for producing ATP—the body’s main energy currency. When mitochondrial function is impaired, even basic activities can lead to exhaustion, brain fog, and chronic illness. Mitochondrial insufficiency may be driven by nutrient deficiencies, toxin exposure (like mold or heavy metals), infections, oxidative stress, or inherited mutations. Functional medicine evaluates mitochondrial status using organic acid and nutrient testing, and supports recovery through targeted supplementation, detoxification, and stress reduction to help restore energy production at the cellular level.