NAD+ is a molecule that quietly runs in every cell in your body.
NAD+ (short for "nicotinamide adenine dinucleotide") is a coenzyme your cells rely on for energy production, DNA repair, and keeping their mitochondria healthy. It isn't a vitamin, and it isn't a stimulant. When it runs low, things slow down, break down, and wear out faster.
And NAD+ levels drop measurably as you age. Researchers have tracked that decline in blood, muscle, saliva, skin, and brain tissue, and it has been linked to metabolic disease, cardiovascular problems, frailty, and neurodegenerative conditions like Alzheimer's.
What NAD+ Actually Does in Your Brain
NAD+ has a few main jobs:
- Powers your brain. Your brain burns roughly 20% of your body's energy while making up only about 2% of your weight. NAD+ sits right in the middle of the pathways that keep brain cells fueled.
- Helps repair DNA. NAD+-dependent enzymes called sirtuins and PARPs help fix damaged DNA and manage which genes are switched on. Built-up DNA damage in brain cells is one of the signatures of aging.
- Protects neurons and calms brain inflammation. NAD+ keeps mitochondria healthy, and healthy mitochondria are what keep brain cells alive and resilient against stress and inflammation.
The Takeaway
NAD+ is one of the most fundamental molecules for brain health, tied to energy, DNA repair, and neuroprotection. Levels fall as you age, and topping them up promising for longevity and backed by strong preclinical science.