Eric Verdin, M.D., and Peter Attia, M.D., discuss the controversy surrounding NAD+ (nicotinamide adenine dinucleotide), the best method for replenishing NAD+, and more.


The theory says our brain allocates resources to energy-consuming senescent cells at the body’s expense, accounting for gray hair, muscle shrinkage, and other signs of aging.

Aging &amp; Longevity

A natural supplement, quercetin, targets age-promoting senescent cells, reduces inflammation, and counteracts blood vessel aging in men with heart disease. 

Study conducted at the University of Montreal in Quebec, Canada (image: ledevoir.com) 

Clinical Trials

Model: Cybrids composed of Rho0 cells with human platelet mitochondrial DNA from participants between 7 days old and 99 years old 
Dosage: 5 mM of n-Acetyl-L-Cysteine and 3 mM of nicotinamide riboside, with medium changed every three days until the cell population reached between 1 and 10 million

New Study: Combining NR with NAC May Slow Telomere Shortening

New research suggests that nicotinamide riboside (NR) combined with N-acetyl cysteine (NAC) prevents telomere shortening linked to genetic sequences within the cell’s powerhouse (mitochondria) in human cells.

(Telomeres [highlighted in gold] at the ends of a chromosome | NAD.com)

A new study suggests the NAD+ precursor NR combined with the antioxidant NAC may counteract telomere shortening, a hallmark of aging.

Participants: Healthy middle-aged adults (average age: 55)
Dosage: 100 mg/day of Monarda didyma L. extract, preferably at lunchtime with plenty of water, for 12 weeks

An extract made from Monarda didyma L. reduces the biological age of older adults while improving their quality of life. 

A flower from the Monarda didyma L. plant (image: nativeplanttrust.org) 

Search Result: Cellular Senescence

Top Aging Expert & Peter Attia Discuss NAD+ Precursors: Taking NMN and NR Together

Are Senescent Cells Turning Your Hair Gray? A New Aging Theory

A Natural Senolytic Supplement Curbs Heart Aging in New Clinical Trial

New Study: Combining NR with NAC May Slow Telomere Shortening

Flower Extract Slows Cellular Aging, New Study Shows