Quick answer: NAD+ is a coenzyme found in every cell. It helps turn food into energy in mitochondria and fuels enzymes that repair DNA and regulate metabolism. The body makes NAD+ from tryptophan and forms of vitamin B3 (niacin), and recycles it constantly. Levels tend to decline with age. Exercise, sleep, a nutrient-rich diet and time-restricted eating may support it; supplement research is still early.
What is NAD+?
Nicotinamide adenine dinucleotide (NAD+) is a helper molecule that carries electrons in energy production and acts as fuel for repair enzymes.
How your body makes NAD+
From tryptophan
An amino acid in protein foods. This pathway relies on vitamin B6, riboflavin and iron. Chronic inflammation can divert tryptophan away from this route.
From niacin (vitamin B3)
Nicotinic acid and nicotinamide from foods like poultry, fish, meat and legumes are converted to NAD+. Large amounts of nicotinic acid cause flushing.
Recycling (the salvage pathway)
Most NAD+ is recycled from nicotinamide. Precursors studied as supplements include nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN).
Why NAD+ matters for aging
NAD+ sits at the center of several processes that change with age, explained in plain language:
DNA repair
Repair enzymes called PARPs use NAD+ to fix DNA damage. When damage is high, they can use up NAD+.
Mitochondrial energy
Mitochondria need NAD+ to make energy. Lower NAD+ is linked with less efficient mitochondria and more oxidative stress. See mitochondrial health.
Sirtuins and metabolism
Sirtuins are NAD+-dependent proteins that help regulate metabolism, inflammation and stress responses.
Detoxification
NAD+ supports liver enzymes that process alcohol and other compounds. See how detoxification works.
Supporting NAD+ naturally
- Regular exercise, especially aerobic and strength training
- Consistent, quality sleep
- A diet with enough protein and niacin-rich foods
- Time-restricted eating may help some people (see intermittent fasting)
- Limiting alcohol
What about supplements?
NR and NMN raise NAD+ levels in human studies, but evidence that they improve health outcomes in people is still limited, and long-term safety is not established. High-dose niacin can affect the liver and blood sugar. Discuss any supplement with your provider. Reference ranges vary by lab, age and sex. Your provider interprets your result against the lab’s range and your overall picture, rather than chasing a single number.
Healthy aging lens
NAD+ connects energy, repair and metabolism, which are all central to how we age. Lifestyle remains the best-supported way to support it. See metabolism and longevity.
When to see a naturopathic doctor
- Symptoms that are ongoing, worsening or affecting daily life
- You take medications or have a chronic condition and are considering supplements
- You want a personalized, root-cause plan
- You are pregnant or breastfeeding
See a medical provider promptly for chest pain, trouble breathing, severe abdominal pain, high fever, or signs of an allergic reaction.
Want a personalized plan?
Book a Free 15-Minute ConsultA free 15-minute consultation with Dr. Kneessi. No cost, no obligation. In-office in Odenton, MD or by telehealth.
Frequently asked questions
What is NAD+?
A coenzyme in every cell needed for energy production and DNA repair.
Does NAD+ decline with age?
Research shows levels tend to fall with age.
Do NAD+ supplements work?
They raise NAD+ levels, but health benefits in people aren’t yet proven.
How can I support NAD+ naturally?
Exercise, sleep, a nutrient-rich diet and limiting alcohol.
Sources
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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