Compound Deep-Dive

Tier 4: PeptideA potent longevity drug with robust animal evidence, but human use remains experimental and requires strict medical supervision.

Rapamycin

SirolimusRapamune

High potential, medical supervision required.

Hype Risk

7/10

Noticeability

4/10

Evidence Tier

Emerging

Cost / Month

~$40

Experimental drug

What it's actually good for

Longevity

Research Supported

Extends lifespan in all tested animal models; human biomarker data is promising but preliminary.

Muscle

Not Supported

mTOR inhibition is fundamentally anti-anabolic and can blunt muscle protein synthesis.

Energy: neutralFocus: neutralSleep: neutralRecovery: misalignedMood: neutralImmunity: neutral

How it works

Rapamycin is a potent mTOR inhibitor that reliably extends lifespan in multiple animal models. Human evidence for longevity is emerging from safety trials and short-term biomarker studies, but long-term efficacy in healthy adults is not yet proven.

Inhibits the mechanistic target of rapamycin (mTOR), specifically the mTORC1 complex, which regulates cell growth, protein synthesis, and autophagy.

Safety

Can cause mouth sores (stomatitis) even at low doses
May increase blood glucose and lipid levels
Potential for immunosuppression if taken daily or at high doses

The full StackRoast report adds

The exact dose, timing, and effective range to actually run it at
Where people go wrong with it — the dose-creep and timing traps
What Rapamycin clashes with or duplicates in your stack

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Community Reality Check

Distilled from 500 threads

Confidence: high

What users report

Reduced systemic inflammation
Joint pain relief
Longevity potential

The catch

Mouth sores
Acne
Lipid changes

Side effects reported

Mouth sores
Acne
Increased lipids

https://www.reddit.com/r/Rapamycin/https://www.reddit.com/r/longevity/

The Receipts

9 sources— studies, videos & links

Videos

Rapamycin: potential longevity benefits, surge in popularity, and more

Peter Attia MD

A deep dive into the history and longevity potential of rapamycin with world-leading experts.

An introduction to the study of RAPAMYCIN

Optispan

Dr. Matt Kaeberlein explains the biological mechanisms of rapamycin and its impact on aging.

Papers

Mannick et al. 2014rct2014

Low-dose mTOR inhibition improved immune function and vaccine response in elderly humans.

Harrison et al. 2009observational2009

First study to show that rapamycin extends lifespan in mice even when started late in life.

PEARL Trial 2025rct2025

A 48-week trial showing that intermittent low-dose rapamycin is safe and improves lean mass in women.

Creators

Peter Attia

YouTube

Physician focused on longevity who has extensively covered rapamycin research and clinical use.

Matt Kaeberlein

YouTube

Leading biogerontologist and researcher who has published over 200 papers on the biology of aging.

Clinical Sources

Mannick et al. (2014)clinical Harrison et al. (2009)clinical

Taking Rapamycin in a stack? Find out if the combination actually makes sense.

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