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What Are Mitochondria and What Do They Do?
Mitochondria are organelles found in nearly every cell of the human body. Often called the “powerhouses of the cell,” they are responsible for producing approximately 90% of the body’s energy in the form of adenosine triphosphate (ATP). But mitochondria do far more than generate energy:
- ATP production: Through oxidative phosphorylation, mitochondria convert nutrients from food into usable cellular energy
- Calcium signaling: Regulate intracellular calcium, essential for muscle contraction, nerve transmission, and cell signaling
- Apoptosis regulation: Control programmed cell death—a critical process for removing damaged cells and preventing cancer
- Heat production: Generate body heat through uncoupled respiration
- Hormone synthesis: Participate in the production of steroid hormones and vitamin D
- Immune regulation: Mitochondrial signals activate innate immune responses
- Reactive oxygen species (ROS) management: Both produce and manage free radicals as part of normal cellular signaling
Each cell contains hundreds to thousands of mitochondria, depending on energy demand. Cells with the highest energy requirements—brain neurons, heart muscle cells, skeletal muscle, liver, and kidneys—contain the most mitochondria and are therefore most vulnerable to mitochondrial dysfunction.
At St. George Hospital (Klinik St. Georg) in Bad Aibling, Germany, we recognize mitochondrial dysfunction as a central driver of chronic fatigue, cognitive decline, pain syndromes, and accelerated aging. Dr. Julian Douwes, Chief Medical Officer, states: “When mitochondria fail, everything fails. The fatigue, brain fog, pain, and exercise intolerance that so many patients experience can often be traced back to impaired mitochondrial function. Addressing the mitochondria is addressing the root cause.”
How Mitochondria Fail: The Mechanisms of Dysfunction
Oxidative Stress and Free Radical Damage
Mitochondria are both the primary producers and primary targets of reactive oxygen species (ROS). During normal energy production, a small percentage of electrons “leak” from the electron transport chain and react with oxygen to form superoxide radicals. Under healthy conditions, antioxidant defense systems (superoxide dismutase, glutathione, catalase) neutralize these free radicals.
When the balance tips—due to toxin exposure, chronic inflammation, or nutritional deficiency—oxidative damage accumulates in mitochondrial membranes, proteins, and DNA. Mitochondrial DNA (mtDNA) is particularly vulnerable because it lacks the protective histone proteins and sophisticated repair mechanisms that protect nuclear DNA.
Mitochondrial DNA Mutations
Mitochondria contain their own circular DNA genome (mtDNA), which encodes 13 essential proteins of the electron transport chain. Damage to mtDNA impairs the production of these proteins, reducing energy output. Unlike nuclear DNA damage, mtDNA mutations can accumulate rapidly because:
- mtDNA is located directly adjacent to the electron transport chain (the primary source of ROS)
- mtDNA repair mechanisms are less robust than nuclear DNA repair
- mtDNA lacks protective histones
- Each mitochondrion contains multiple copies of mtDNA, and the ratio of mutated to normal copies (heteroplasmy) determines functional impact
Impaired Mitophagy
Mitophagy is the process by which damaged mitochondria are selectively identified and degraded. It is essentially quality control for the mitochondrial population. When mitophagy fails—as it does increasingly with age—damaged mitochondria accumulate, reducing overall cellular energy output and increasing ROS production.
Nutrient Deficiencies
Mitochondrial energy production requires numerous cofactors and substrates:
- CoQ10 (ubiquinone): Essential electron carrier in the respiratory chain
- NAD+: Critical coenzyme for multiple steps of energy production
- Magnesium: Required for ATP stabilization and hundreds of enzymatic reactions
- B vitamins: B1, B2, B3 (niacin), and B5 are all essential for mitochondrial metabolism
- Iron: Required for electron transport chain complexes
- Alpha-lipoic acid: Mitochondrial antioxidant and cofactor
- L-carnitine: Transports fatty acids into mitochondria for beta-oxidation
Deficiency in any of these nutrients can impair mitochondrial function.
Symptoms of Mitochondrial Dysfunction
Because mitochondria are present in virtually every cell, dysfunction can manifest in almost any organ system. The organs with the highest energy demands are affected first and most severely.
Fatigue and Exercise Intolerance
- Persistent, debilitating fatigue that is not relieved by rest
- Post-exertional malaise (worsening of symptoms after physical or mental exertion)
- Reduced exercise capacity compared to previous baseline
- Prolonged recovery time after activity
This is the hallmark symptom and the most common reason patients seek evaluation. Visit our chronic fatigue treatment program for more information.
Cognitive Symptoms (“Brain Fog”)
- Difficulty concentrating and maintaining focus
- Impaired short-term memory
- Slow processing speed
- Word-finding difficulties
- Mental fatigue after cognitive tasks
Pain and Musculoskeletal Symptoms
- Widespread muscle pain (myalgia)
- Joint pain without structural damage
- Muscle weakness and wasting
- Cramping and spasms
- Fibromyalgia-like presentation
Neurological Symptoms
- Peripheral neuropathy (numbness, tingling, burning)
- Headaches and migraines
- Dizziness and balance problems
- Seizures (in severe mitochondrial disease)
- Autonomic dysfunction (heart rate variability, temperature regulation)
Cardiovascular Symptoms
- Heart palpitations and arrhythmias
- Exercise-related cardiac symptoms
- Cardiomyopathy (in severe cases)
Other Manifestations
- Gastrointestinal dysfunction (slow motility, bloating, constipation)
- Hearing loss and visual disturbances
- Immune dysfunction and frequent infections
- Hormonal imbalances
- Premature aging
What Causes Mitochondrial Dysfunction?
Chronic Infections
Chronic infections are among the most significant acquired causes of mitochondrial damage:
- Lyme disease and co-infections: Borrelia burgdorferi and associated pathogens directly damage mitochondria and trigger chronic inflammatory responses that further impair mitochondrial function. See our Lyme disease treatment program.
- Post-COVID syndrome: SARS-CoV-2 has been shown to directly impair mitochondrial function, and the persistent inflammation of long COVID perpetuates mitochondrial damage. Learn about our post-COVID treatment approach.
- Epstein-Barr virus (EBV) reactivation: Common in patients with chronic fatigue and immune dysfunction
- Mycoplasma and other intracellular pathogens
Environmental Toxins
- Heavy metals: Mercury, lead, arsenic, and cadmium directly inhibit mitochondrial enzymes
- Pesticides and herbicides: Many organophosphates and glyphosate impair mitochondrial electron transport
- Mold toxins (mycotoxins): Ochratoxin, aflatoxin, and trichothecenes are potent mitochondrial toxins
- Air pollution: Particulate matter and volatile organic compounds increase mitochondrial oxidative stress
Aging
Mitochondrial function declines naturally with age through the accumulation of mtDNA mutations, reduced mitophagy efficiency, and declining NAD+ levels. This age-related decline is a central mechanism of the aging process itself (Sun et al., Antioxidants & Redox Signaling, 2016).
Chronic Stress and Cortisol
Prolonged cortisol elevation impairs mitochondrial biogenesis and increases oxidative damage. The stress-mitochondria-fatigue connection is well-documented in burnout and chronic fatigue syndromes.
Medications
Several common medications can impair mitochondrial function:
- Statins (reduce CoQ10 synthesis)
- Certain antibiotics (fluoroquinolones, aminoglycosides)
- Metformin (at high doses, inhibits complex I)
- Acetaminophen (depletes glutathione)
- Certain antivirals and chemotherapy agents
Nutritional Deficiencies
As detailed above, deficiencies in CoQ10, NAD+ precursors, magnesium, B vitamins, iron, and other cofactors directly impair mitochondrial energy production.
Diagnostic Evaluation at St. George Hospital
Our diagnostic approach to mitochondrial dysfunction includes:
Blood and Urine Testing
- Organic acids test: Evaluates metabolic intermediates of the Krebs cycle and electron transport chain; identifies blocks in energy production pathways
- CoQ10 levels: Often depleted in mitochondrial dysfunction
- NAD+/NADH ratio: Reflects mitochondrial redox status
- Lactate and pyruvate: Elevated lactate or abnormal lactate:pyruvate ratio suggests impaired oxidative metabolism
- Oxidative stress markers: 8-OHdG (DNA damage), lipid peroxides, glutathione (reduced and oxidized)
- Inflammatory markers: CRP, IL-6, TNF-alpha
- Heavy metal screening: Blood and urine metals panel
- Nutrient status: Magnesium (RBC), B vitamins, iron studies, vitamin D, amino acids
Functional Testing
- Exercise testing with metabolic analysis: Evaluates aerobic capacity and anaerobic threshold
- Heart rate variability (HRV): Assesses autonomic nervous system function and mitochondrial energy status
- Bioenergetic health index: Cellular respiration testing when available
Treatment: Restoring Mitochondrial Function
IHHT (Interval Hypoxia-Hyperoxia Training)
IHHT is one of our most powerful tools for mitochondrial rehabilitation:
- The patient breathes alternating intervals of low-oxygen (hypoxic) and high-oxygen (hyperoxic) air through a comfortable mask while resting
- Hypoxic phase: Triggers mitophagy—the selective destruction of damaged, inefficient mitochondria
- Hyperoxic phase: Stimulates mitochondrial biogenesis—the creation of new, healthy, efficient mitochondria
- Result: The mitochondrial population shifts from old and damaged to young and efficient
- Protocol: Typically 10–15 sessions over 2–3 weeks
NAD+ Restoration
NAD+ is the single most critical cofactor for mitochondrial energy production. Our intravenous NAD+ therapy delivers therapeutic doses directly to the bloodstream:
- Immediate substrate for mitochondrial complex I
- Activates sirtuins (SIRT1, SIRT3) that protect mitochondria
- Supports DNA repair enzymes (PARPs)
- Typical protocol: 5–10 IV infusions over 1–3 weeks
CoQ10 Supplementation
- Ubiquinol (the reduced, bioactive form) is preferred over ubiquinone
- Therapeutic doses: 200–600 mg daily
- Essential for patients on statin medications
- Supports electron transfer between complexes II/III in the respiratory chain
Intravenous Nutrient Therapy
- High-dose vitamin C: Antioxidant protection for mitochondrial membranes
- Glutathione: The master intracellular antioxidant; protects mtDNA from oxidative damage
- Alpha-lipoic acid: Mitochondrial antioxidant that also regenerates other antioxidants (vitamin C, vitamin E, glutathione)
- B-vitamin complex: Essential cofactors for Krebs cycle and electron transport chain
- Magnesium: Required for ATP stabilization and hundreds of enzymatic reactions
Ozone Therapy
Medical ozone therapy benefits mitochondria through:
- Activation of the Nrf2 antioxidant response pathway
- Improved oxygen utilization in tissues
- Reduction of chronic inflammation that damages mitochondria
- Enhanced red blood cell flexibility and oxygen delivery
Addressing Root Causes
- Infection treatment: Addressing chronic Lyme, EBV, or other persistent infections
- Detoxification: Heavy metal chelation, mold avoidance, reduction of environmental toxin burden
- Hormone optimization: Thyroid, cortisol, and sex hormone optimization support mitochondrial function
- Gut health: Restoring intestinal barrier integrity and microbiome diversity to reduce systemic inflammation
Frequently Asked Questions
Can mitochondrial dysfunction be reversed?
In many cases, yes—particularly when the dysfunction is acquired rather than genetic. Acquired mitochondrial dysfunction from chronic infections, toxin exposure, nutrient depletion, or aging responds well to targeted treatment. The body’s ability to generate new mitochondria (biogenesis) means that with the right support, the mitochondrial population can be renewed. However, the degree of recovery depends on the severity and duration of dysfunction, the underlying cause, and the comprehensiveness of treatment.
How long does treatment take?
Initial improvements in energy and cognitive function are often noticed within the first 1–2 weeks of intensive treatment (IV NAD+, IHHT, nutrient therapy). More substantial and sustained recovery typically develops over 2–3 months. Patients with severe, long-standing mitochondrial dysfunction may require ongoing support over 6–12 months. The timeline varies based on the underlying cause and individual response.
Is mitochondrial dysfunction the same as mitochondrial disease?
No. Primary mitochondrial diseases are rare genetic disorders caused by mutations in mitochondrial or nuclear DNA that severely impair mitochondrial function from birth. Mitochondrial dysfunction, as discussed in this article, is an acquired condition in which previously healthy mitochondria become impaired due to infection, toxins, aging, nutrient depletion, or other factors. Acquired mitochondrial dysfunction is far more common and far more treatable than primary mitochondrial disease.
Can CoQ10 alone fix mitochondrial dysfunction?
CoQ10 is important but is rarely sufficient on its own. Mitochondrial dysfunction typically involves multiple impaired pathways and depleted cofactors. Effective treatment requires a comprehensive approach that addresses NAD+ depletion, oxidative stress, nutrient deficiencies, inflammation, and the underlying cause (infection, toxin, etc.). CoQ10 is one component of a multi-targeted mitochondrial support strategy.
Restore Your Cellular Energy
If you are experiencing persistent fatigue, brain fog, pain, or exercise intolerance, mitochondrial dysfunction may be the underlying driver. Contact St. George Hospital to discuss comprehensive evaluation and treatment options.
Phone: +49 (0)8061 398-0
Email: info@clinicum-stgeorg.de
Location: Rosenheimer Str. 6-8, 83043 Bad Aibling, Germany
Disclaimer: The treatments described in this article are offered as part of an integrative medical approach to mitochondrial dysfunction. Individual outcomes vary based on the underlying cause, severity, and duration of dysfunction. This article is for educational purposes and does not constitute medical advice. Always consult with qualified healthcare professionals regarding your specific condition.
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