Top Evidence-Based Interventions to Lower Biological Age

Epigenetic aging clocks estimate biological age based on DNA molecular tagging patterns, and interventions like semaglutide and ketamine reduce these estimates in humans.

(The principal investigator behind the review on interventions that influence biological age, Dr. David Sinclair | The Society of the Four Arts)

As reviewed in this article, epigenetic aging clocks have estimated the effects of pharmaceutical interventions, lifestyle habits, supplements, and clinical interventions on biological age.

Aging &amp; Longevity

Participants: Healthy, overweight older adults 
Dosage: 6 mg/day of spermidine supplemented orally for 13 weeks

Oxford scientists find that spermidine, a naturally occurring molecule that declines with age, rejuvenates aging immune cells and improves vaccine protection in older adults. 


Study conducted at the University of Oxford in England. 

Immunity

Participants: Sedentary older adults 
Dosage: 6 mg/week of rapamycin

In older adults, the FDA-approved drug rapamycin, associated with prolonging lifespan, blunts improvements in physical performance.

Skin &amp; Muscle

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.

Harvard: Microbiome Depletion Rejuvenates the Aging Brain

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). 

Search Result: senescent cells

Top Evidence-Based Interventions to Lower Biological Age

Spermidine Boosts Immune Cells and Vaccine Protection, New Study Shows

Rapamycin and Exercise: New Study Finds Potential Performance Decline

Aging Guru Bryan Johnson’s Supplement List for 2026

New Harvard Study: Microbiome Depletion Rejuvenates the Aging Brain