What Is NAD+? Benefits, Science & How to Choose a Quality Supplement

What is NAD+?

NAD, short for Nicotinamide Adenine Dinucleotide, is a naturally occurring molecule found in every cell of the body. Its main role is to help convert the food you eat into usable energy while supporting healthy cellular function. Without NAD, your body would be unable to efficiently turn food into the fuel your cells need to function.

Signs NAD+ levels decline with age

Although NAD is naturally produced in the body, its levels can decline by as much as 50% with age. Reduced NAD levels are associated with lower energy production, slower cellular repair, and visible signs of ageing. To help support healthy NAD levels and minimise these effects, many people choose to take NAD supplements.

Potential benefits of supplementation

NAD is becoming an increasingly popular supplement with people taking it for a variety of health and wellness goals.

Anti-Aging:

As previously mentioned, NAD levels decline with age. This contributes to cellular degradation (the irreversible decline to the function of cells). Supplementation aims to restore NAD levels to improve cellular longevity and delay aging.

Energy Production:

NAD’s primary role is to help your body produce energy.

Here’s how it works: NAD+ sits inside your cells, ready to collect electrons released when your body breaks down food. Once NAD+ picks up these electrons along with a hydrogen atom, it transforms into NADH, a molecule that carries this stored energy to the mitochondria, the cell’s energy-producing powerhouse.

Inside the mitochondria, NADH releases the electrons to help generate ATP, the body’s main source of energy. This cycle happens continuously, powering your cells every second of the day.

Cognitive Support:

Research suggests that NAD may help support cognitive health by fuelling energy production within brain cells, which can help reduce fatigue and improve mental clarity. It has also been linked to reduced neuroinflammation and potentially slowing age-related cognitive decline.

DNA Repair

DNA is constantly exposed to damage, but the body has built-in systems that work around the clock to detect and repair it. Key repair proteins known as PARPs (poly ADP-ribose polymerases) rely on NAD+ to send repair signals and recruit other proteins needed for the process.

When NAD+ levels are low, these repair processes can slow down and become less efficient, making it harder for cells to maintain healthy DNA.

How to avoid fake NAD+ supplements

As NAD+ supplements continue to grow in popularity, concerns around product quality and authenticity are also increasing. Reports of counterfeit or misleading products have become increasingly common, with recent testing and industry investigations revealing that some NAD+ supplements contain only minimal amounts of the advertised active ingredient and in some cases, none.

That’s why third-party testing and quality assurance are so important. At Applied Nutrition, every product is developed with a strong focus on safety, transparency, and quality. Our supplements are tested to ensure they contain no substances prohibited by the World Anti-Doping Agency (WADA), giving customers confidence that they are using products made with trusted, approved ingredients.

We also maintain the highest standards throughout the manufacturing process, supported by respected accreditations including Informed Sport and Informed Manufacturer certifications. These certifications help ensure consistent quality, safety, and integrity across every stage of production.

Our NAD+ is sourced from a clinically validated facility specialising in maximised stabilised NAD+ and manufactured to the highest industry standards, including GMP, ISO 22000, BRC AA+, FDA, Informed Sport, and Halal certification. We are so confident in the purity and quality of our premium NAD+ that every ingredient is transparently labelled, containing only powerful active ingredients with no unnecessary fillers. This commitment to excellence is what sets our product apart from others on the market.

In a category where many NAD+ supplements reach the market without adequate testing, we want to reassure our partners and customers that our NAD+ capsules are different. Every batch undergoes rigorous third-party testing with Eurofins, a globally trusted laboratory, to guarantee the highest standards of safety, purity, and efficacy. We also carry out regular analyses to ensure ongoing consistency, potency, and quality across every production run.

Transparency is central to our values, which is why we proudly invest in independent testing and certification to give both customers and partners complete confidence in our products. To further support this commitment, we will also attach our certification documents within this blog for full transparency and verification.