NAD+

NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme present in all living cells that plays fundamental roles in cellular metabolism and energy production. While technically a dinucleotide rather than a peptide, NAD+ is frequently discussed alongside peptides in the longevity and wellness space. It serves as an essential cofactor for over 500 enzymatic reactions, including those involved in the electron transport chain (ATP production), DNA repair (via PARP enzymes), and epigenetic regulation (via sirtuins).

The significance of NAD+ in aging research has been one of the most important developments in gerontology over the past two decades. NAD+ levels decline substantially with age — studies have shown approximately 50% reduction by middle age compared to youth. This decline is associated with mitochondrial dysfunction, increased DNA damage, chronic inflammation, and metabolic deterioration. The concept of restoring NAD+ levels to youthful ranges as an anti-aging strategy has generated enormous research interest and commercial activity.

Multiple strategies for boosting NAD+ levels have been investigated. Precursor supplementation with nicotinamide riboside (NR) or nicotinamide mononucleotide (NMN) provides the building blocks for NAD+ synthesis. Direct IV infusion of NAD+ delivers the molecule directly but is expensive and time-consuming. Exercise and caloric restriction naturally boost NAD+ levels. Inhibition of CD38, an enzyme that consumes NAD+, is another research approach.

Clinical research on NAD+ restoration is still in early stages. While animal studies have shown remarkable benefits from NAD+ boosting — including improved mitochondrial function, enhanced insulin sensitivity, neuroprotection, and even extended lifespan in some models — human clinical trials have shown more modest results. NR and NMN supplementation can increase blood NAD+ levels, but whether this translates to meaningful clinical benefits in humans requires further large-scale study.