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NADH – Function, Effects & Supplementation

NADH is the reduced form of NAD+ and a key coenzyme in cellular energy metabolism. It plays a central role in ATP production and is also studied as a dietary supplement for fatigue and cognitive health.

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Things worth knowing about "NADH"

NADH is the reduced form of NAD+ and a key coenzyme in cellular energy metabolism. It plays a central role in ATP production and is also studied as a dietary supplement for fatigue and cognitive health.

What is NADH?

NADH (nicotinamide adenine dinucleotide, reduced form) is a coenzyme found in every living cell. It is produced when NAD+ (the oxidized form) accepts a hydrogen ion and two electrons – a process called reduction. NADH is therefore the energy-rich, biologically active form of the molecule and belongs to the family of coenzymes derived from vitamin B3 (niacin).

Biological Function and Mechanism of Action

NADH plays a central role in cellular energy metabolism. Its key functions include:

Electron transport chain: In the mitochondria, NADH donates its electrons to Complex I of the respiratory chain. The energy released is used to synthesize ATP (adenosine triphosphate) – the universal energy currency of the cell. Each molecule of NADH can generate up to 2.5 molecules of ATP.
Glycolysis and citric acid cycle: During glucose breakdown and the Krebs cycle, NAD+ is reduced to NADH, acting as an electron shuttle.
Antioxidant activity: As an electron donor, NADH can help neutralize harmful free radicals and reduce oxidative stress in cells.
Neurotransmitter synthesis: NADH is involved in the biosynthesis of dopamine, norepinephrine, and other neurotransmitters.
DNA repair: Through the NAD+/NADH cycle, enzymes such as PARP (poly-ADP-ribose polymerase) are activated, which are essential for DNA repair mechanisms.

Medical Applications and Supplementation

NADH is available as a dietary supplement and has been investigated in several clinical contexts:

Chronic Fatigue Syndrome (CFS/ME)

Several clinical trials have examined whether NADH supplementation can improve energy production and reduce symptoms such as persistent fatigue in patients with myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS). Some controlled studies have shown promising results, although the overall evidence base remains limited.

Cognitive Function and Neurodegenerative Diseases

There is emerging evidence that NADH may have neuroprotective properties. Studies on Alzheimer disease and Parkinson disease have explored its effects on dopamine metabolism and mitochondrial function. The clinical relevance is still under investigation.

Sports Nutrition and Performance

Due to its role in ATP synthesis, NADH has been discussed as a performance-enhancing supplement in sports nutrition. However, scientific evidence in this area remains inconsistent.

Dosage and Administration

As a dietary supplement, NADH is typically offered in doses of 5 to 20 mg per day. It is generally recommended to take NADH on an empty stomach, as an acidic gastric environment may compromise the stability of the molecule. Enteric-coated formulations may improve bioavailability.

Safety and Side Effects

NADH is considered well tolerated at commonly used doses. The following points should be noted:

Some users report sleep disturbances when NADH is taken later in the day, as it may have a stimulating effect.
Mild gastrointestinal complaints such as nausea or stomach pressure are occasionally reported.
Drug interactions are not well documented, but caution is advised when combining NADH with antidepressants or dopaminergic substances.
Pregnant and breastfeeding individuals should consult a healthcare professional before use.

Natural Sources and Endogenous Production

The body synthesizes NADH from niacin (vitamin B3) and precursors such as tryptophan. Foods that are rich in niacin and support NAD+/NADH availability include:

Meat and fish (especially tuna, chicken, and beef)
Legumes and peanuts
Whole grain products
Mushrooms
Dairy products and eggs

References

Birkmayer JGD et al. - Nicotinamide adenine dinucleotide (NADH) - A new therapeutic approach to Parkinson's disease. Comparison of oral and parenteral application. Acta Neurologica Scandinavica, 1993.
Forsyth LM et al. - Therapeutic effects of oral NADH on the symptoms of patients with chronic fatigue syndrome. Annals of Allergy, Asthma & Immunology, 1999; 82(2): 185-191.
Verdin E. - NAD+ in aging, metabolism, and neurodegeneration. Science, 2015; 350(6265): 1208-1213.

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