Harvard researchers find that aged mice lacking gut bacteria exhibit a brain more like that of young mice. 

The Principal Investigator of the study, Dr. Lee Rubin (image: harvard.edu). 

Brain &amp; Neurons

Participants: Healthy overweight adults between the ages of 45 and 55 
Dosage: 3 grams/day of ginseng for 28 days

Ginseng supplementation boosts NAD+ (nicotinamide adenine dinucleotide) and lengthens telomeres in middle-aged adults, suggesting an amelioration of aging. 


Panax ginseng Meyer (image: farmaimpresa.com).

Aging &amp; Longevity

Model: 11-month-old male C57BL/6J mice 
Dosage: 30 mg/kg/day of NTX-748 (based on a small molecule called 78c) for 4 months, administered orally

Buck Institute scientists find that blocking the CD38 enzyme, which elevates NAD+ (nicotinamide adenine dinucleotide), counteracts age-related cognitive and physical decline in mice.  

Study conducted at the Buck Institute for Research on Aging (image: linkedin.com).

Model: Young (2- to 4-month-old) and aged (9- to 10-month-old) C57Bl/6JR mice, APP/PS1 mice, and 5xFAD mice 
Dosage: 0.2 mg/mL of doxycycline in drinking water starting at least 7 days before surgery and ceased 2 days before the partial cellular reprogramming window for engram tagging, after which it was immediately reintroduced

Gene Therapy Restores Cognitive Function in Aging and Alzheimer’s Disease

Delivering a gene therapy targeting ensembles of neurons that store memories restores learning and memory capabilities in mouse models of aging and Alzheimer’s disease.

(The study’s principal investigator, Professor Johannes Gräff | 24 Heures)

A partial cellular reprogramming gene therapy targeting memory trace cells restores facets of learning and memory in aged mice and those modeling Alzheimer’s disease.

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

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). 

Search Result: cognitive decline

New Harvard Study: Microbiome Depletion Rejuvenates the Aging Brain

Ginseng Boosts NAD+ and Telomeres: New Study in Middle-Aged Adults

Blocking NAD+ Breakdown Improves Cognitive and Physical Performance: New Study

Gene Therapy Targeting Memory-Encoding Neurons Restores Cognitive Function in Aging and Alzheimer’s Disease

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