NAD and Longevity: What Science Says About Boosting a Key Molecule of Ageing

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Nicotinamide adenine dinucleotide (NAD) has become a major topic in longevity research, with claims that increasing its levels could slow ageing and help people live longer. NAD is a molecule found in every cell of the body and is partly produced from vitamin B3, also known as niacin.

Scientists have long known that NAD is essential for basic cellular functions. It plays a key role in energy production within mitochondria, helps repair DNA, and supports proteins involved in stress response and inflammation control. Because of these functions, NAD is closely linked to overall cellular health.

Recent studies have shown that NAD levels decline with age. This reduction is associated with poorer mitochondrial function, increased cellular stress, and reduced ability to maintain DNA stability. These changes are widely recognised as core features of the ageing process. As a result, researchers have questioned whether restoring NAD levels could help slow age-related decline.

The body does not absorb NAD directly from food. Instead, it makes NAD from dietary precursors such as tryptophan and different forms of vitamin B3, including niacin, nicotinamide, nicotinamide riboside (NR), and nicotinamide mononucleotide (NMN).

Although NAD is constantly recycled in the body, ageing, inflammation, and metabolic stress can reduce its availability.

Studies suggest that supplements containing NR or NMN can increase NAD levels in humans. In some clinical settings, NAD is also administered intravenously, though evidence on long-term benefits remains limited.

While restoring NAD levels may support mitochondrial health and metabolic function, researchers caution against viewing these supplements as anti-aging solutions. At present, there is no clear clinical evidence showing that NAD supplementation slows aging or extends human lifespan.

Experts generally emphasise that NAD-related supplements should be considered a supportive measure rather than a cure.

Any potential benefits are likely to be part of a wider approach to healthy aging that includes balanced nutrition, physical activity, and overall lifestyle management.

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