Metformin vs Rapamycin (Sirolimus)
Both are used for live longer. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| Metformin | Rapamycin (Sirolimus) | |
|---|---|---|
| Human evidence | ★★★★★ | ★★★★★ |
| Legal status | Off-Label, FDA Approved | Off-Label, FDA Approved |
| How it works | Inhibits mitochondrial Complex I, raising the AMP:ATP ratio → activates AMPK. How the AMPK "burn, don't hoard" switch works → the AMPK pathway. On top of that it lowers hepatic gluconeogenesis, improves insulin sensitivity and reshapes the… | Binds FKBP12 to inhibit mTOR complex 1 — flipping cells from growth to maintenance (autophagy, stress resistance, less senescence). What mTOR is and why dialling it down matters → the mTOR pathway. The compound-specific nuance is… |
| In plain English | Metformin trips the same low-fuel switch (AMPK) that exercise does. Diabetics on it have outlived non-diabetics in some data. The catch for athletes: because it partly duplicates the exercise signal, it can blunt muscle and fitness gains… | Rapamycin dials the "grow" switch (mTOR) down periodically, flipping cells into "clean and repair." It extends lifespan in every animal tested — the single most reliable longevity drug — but human data is still coming in. Taken weekly, not… |
| Bottom line | Best for the sedentary/metabolically-at-risk; may cost gains if you train hard. | The most compelling longevity drug we have; still needs human RCTs (PEARL, others ongoing). |
| Availability | Prescription only | Prescription only |
Which is better for live longer?
Both carry a comparable human-evidence rating (★★★★★). Choose on mechanism fit, side-effects, availability and cost rather than evidence strength alone — they work through different mechanisms.
Full breakdowns: Metformin · Rapamycin (Sirolimus).
Common questions
Is Metformin or Rapamycin (Sirolimus) better for live longer?
Both carry a comparable human-evidence rating (★★★★★). Choose on mechanism fit, side-effects, availability and cost rather than evidence strength alone — they work through different mechanisms.
What's the difference between Metformin and Rapamycin (Sirolimus)?
Metformin: Best for the sedentary/metabolically-at-risk; may cost gains if you train hard. — Rapamycin (Sirolimus): The most compelling longevity drug we have; still needs human RCTs (PEARL, others ongoing).