Model: 8-month-old female Swiss mice
Dosage: 200 µL of aged-derived fecal suspension administered orally three days per week for two weeks

New Study: Transferring Gut Microbes from Old to Adult Mice Shortens Lifespan

Spanish scientists unveil data showing that transferring fecal microbes from old to adult mice increases biological age and shortens lifespan.

(A depiction of the intestines filled with gut microbes | Northwestern Medicine)

Spanish scientists show that transferring fecal microbes from old to adult mice increases biological age and shortens lifespan.

Aging &amp; Longevity

Aging Guru Bryan Johnson’s Supplement List for 2026

Changes to Bryan Johnson’s latest supplement stack include taking NMN or NR six days a week, rather than seven, and eliminating the use of rapamycin.

(Bryan Johnson, who utilizes a continuously updated protocol to slow aging and optimize his body | Netflix)

Changes to Bryan Johnson’s updated 2026 supplement stack include taking NMN or NR six days a week instead of seven and removing rapamycin.

Participants: Healthy middle-aged adults 
Dosage: 1200 mg/day of NR for 4 weeks

NR Raises NAD+ 2-Fold More than NMN

NR (nicotinamide riboside) raises blood NAD+ (nicotinamide adenine dinucleotide) levels more than NMN (nicotinamide mononucleotide) in healthy adults. 

Some of the researchers on the study, Dr. Christian Dölle (left) and Dr. Charalampos Tzoulis (middle) from the University of Bergen in Norway (image: uib.no). 

How to Boost Mitochondrial Tissue Density and Quality for Longevity

Lifestyle hacks contrived to promote the tissue density and quality of mitochondria (the cell’s powerhouses) can aid in the efficient generation of cellular energy and reduce inflammation, thereby promoting longevity.

(A colorized image of mitochondria taken with a transmission electron microscope | UC San Diego Today)

Exercise, nutritional support, and lifestyle hacks like cold exposure can all help mitigate mitochondrial dysfunction, a key hallmark of aging.

Model: 22-month-old male C57BL/6NIH mice 
Dosage: 400 mg/kg of NR for eight weeks, administered in food

Treating aged mice with the NAD+ (nicotinamide adenine dinucleotide) precursor NR (nicotinamide riboside) improves memory and reduces pro-inflammatory immune cells.

Senior members of the research team, Dr. Bruce R. Troen and Dr. Kenneth L. Seldeen (image: buffalo.edu).  

Search Result: nervous system

New Study: Transferring Gut Microbes from Old to Adult Mice Shortens Lifespan

Aging Guru Bryan Johnson’s Supplement List for 2026

NR Raises NAD+ Over 2-Fold More than NMN: New Study Comparing NAD+ Precursors

How to Boost Mitochondrial Tissue Density and Quality for Longevity

NAD+ Supplement Improves Memory & Brain Immune Cells, New Study Reveals