The Easter Island molecule that named a protein and became longevity's best-evidenced drug. Rapamycin is the register's longevity capstone, and it's overflowing with remarkable facts. A few: (1) it was found in soil bacteria on Easter Island (Rapa Nui) — and named after the island; (2) it's so centr
Rapamycin (sirolimus) is a small-molecule mTOR inhibitor — and longevity science's flagship. Discovered in soil bacteria on Easter Island (Rapa Nui) and named after the island, it's so fundamental that the master growth-sensing protein mTOR is named after it ("mechanistic Target Of Rapamycin"). It has lived four scientific lives — antifungal, then FDA-approved transplant immunosuppressant (1999), then anticancer, then the anti-aging frontier. Its landmark credential: in the 2009 NIA Interventions Testing Program (Nature), rapamycin extended the lifespan of already-old mice — replicated in three independent labs — making it the only drug proven to extend mammalian lifespan when started in mid-life, and the most reproducible lifespan extender across yeast, worms, flies, and mice. Mechanistically it inhibits mTOR, flipping cells from growth mode into repair mode (autophagy), reducing inflammation, and improving cellular housekeeping. The honest caveats: it's a potent prescription immunosuppressant, not a supplement; the longevity protocol (low weekly dosing) differs entirely from transplant dosing and aims to spare immunity; side effects are real; and — decisively — no human trial has yet demonstrated a longevity benefit (the PEARL RCT showed weekly dosing is reasonably safe, but durable functional benefits await replication). So: the best-evidenced longevity drug we have in animals, an approved and serious medicine, a molecule with a spectacular backstory — and still without human proof that it extends healthy lifespan.
an approved prescription drug (sirolimus) for transplant rejection and LAM. Longevity use is entirely off-label, requiring clinical oversight; there is no approved anti-aging indication.
An honest grade per outcome — drawn from the evidence, not any catalogue. Hype and undemonstrated marketing claims grade low.
A credentialed reviewer (PharmD / PhD / MD) will be named before this entry is finalised. Until then, treat it as a working draft. Last updated July 2026 (the field's key open question: a human RCT with a genuine longevity/healthspan endpoint — none has succeeded yet; intermittent-dosing and rapalog selectivity are the active frontiers).
Grades reflect the published evidence, not our interest. No dosing, reconstitution, or administration is published for research compounds — that restraint is deliberate.
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