NMN, NAD+ & Longevity: The Science of Healthy Aging

The Science of Aging and the Role of NAD+

As we age, our bodies experience a steady decline in Nicotinamide Adenine Dinucleotide (NAD+), a critical coenzyme found in every living cell. NAD+ is essential for fundamental biological processes, including energy metabolism, DNA repair, and the activation of sirtuins. Sirtuins are proteins often referred to as "longevity genes" that protect cells from age-related decline. Research has shown that in some tissues, NAD+ levels can drop by 50% or more over a lifetime.

Nicotinamide Mononucleotide (NMN) is a precursor that the body can readily convert into NAD+. While previous short-term studies in mice and humans suggested that NMN could provide various health benefits, it remained unknown whether long-term administration could actually extend the maximum lifespan of a mammal until this multi-year investigation.

Study Design: A Comprehensive Long-Term Analysis

To answer this question, researchers conducted an extensive study using both male and female mice. This dual-sex approach is significant, as many previous longevity studies focused primarily on one sex, potentially overlooking biological nuances.

The study analyzed four key areas:

1. Lifespan: Whether NMN treatment increased the number of days the mice lived.

2. Healthspan and Frailty: The physical condition and activity levels of the mice as they aged.

3. Metabolic Health: How the treatment affected weight gain, adipose (fat) tissue, and glucose regulation.

4. Safety and Cancer Risk: Whether increasing NAD+ levels—which fuels cellular energy—would inadvertently promote tumor growth or increase cancer burden.

Key Findings

The results revealed that NMN’s effects are significantly influenced by biological sex, offering different types of protection to males and females.

• Lifespan Extension in Females: NMN treatment increased the median lifespan of female mice by 8.5%. Interestingly, a similar significant increase in total lifespan was not observed in the male cohort.

• Reduced Frailty Across Both Sexes: Regardless of whether they lived longer, both male and female mice treated with NMN exhibited lower "frailty scores". They were more active and maintained physical functions that typically decline with age.

• Youthful Gene Expression: The study found that NMN helped maintain "youthful" gene expression patterns, effectively slowing the genetic clock of aging in various tissues.

• Male-Specific Metabolic Protection: In male mice, NMN was particularly effective at slowing the accumulation of fat later in life and improving overall metabolic health.

• The Gut Microbiome Link: Researchers discovered that NMN treatment led to an increase in Anerotruncus colihominis, a beneficial gut bacterium. In humans, this specific bacterium is associated with lower levels of systemic inflammation and increased longevity.

• A Clean Safety Profile: One of the most critical safety findings for human application was that chronic NMN treatment did not increase the number of tumors or the severity of cancer in any tissue. This suggests that long-term NAD+ boosting is likely safe and does not accelerate the progression of pre-existing or age-related cancers.

Actionable Implications for Everyday People

While these findings are based on a mouse model, they provide several "key insights" for individuals interested in longevity and metabolic health:

1. Personalized Longevity: Men and women may experience different primary benefits from NAD+ boosters—with males seeing more metabolic/weight-related benefits and females seeing more significant lifespan extension.

2. Healthspan vs. Lifespan: In addition to the benefits of an additional total number of years lived, the ability of NMN to reduce frailty and maintain physical activity (healthspan) is vital for quality of life in later years.

3. Microbiome Health Matters: The link between NMN and beneficial gut bacteria reinforces the idea that longevity is tied to a healthy microbiome. Supporting gut health through diet or supplements may be a necessary pillar of an anti-aging regimen.

4. Safety Reassurance: This study offers significant reassurance that long-term use of NMN does not appear to fuel tumor growth.

In summary, this research highlights the potential of NMN as a powerful tool for treating age-related conditions and slowing the biological markers of aging, while emphasizing the critical need for continued sex-specific research in human clinical trials.

Juvina Bioscience is using the highest purity NMN in its Cell Activator XR product. NMN is delivered in an acid resistant capsule that ensures best bioavailability for your body. It is packaged in a biophotonic glass, ensuring excellent shelf life.

Source:

“Long-term NMN treatment increases lifespan and healthspan in mice in a sex dependent manner”, Kane AE, Chellappa K, Schultz MB, Arnold M, Li J, Amorim J, Diener C, Zhu D, Mitchell SJ, Griffin P, Tian X, Petty C, Conway R, Walsh K, Shelerud L, Duesing C, Mueller A, Li K, McNamara M, Shima RT, Mitchell J, Bonkowski MS, de Cabo R, Gibbons SM, Wu LE, Ikeno Y, Baur JA, Rajman L, Sinclair DA. bioRxiv. 2024. Link