Rapamycin

01 What is Rapamycin?

Rapamycin holds a unique position in longevity science: it's the only compound that has consistently extended lifespan across every species tested — yeast, worms, flies, and mice. In mice, it extended lifespan by 9-14% even when started late in life. Nothing else has this track record. Originally discovered in soil samples from Easter Island (Rapa Nui — hence the name) and approved as an immunosuppressant for organ transplant patients, rapamycin has become the most debated compound in the longevity space. A growing number of doctors are prescribing it off-label for anti-aging, while mainstream medicine remains cautious.

02 How Does It Work?

Rapamycin inhibits mTOR (mechanistic Target of Rapamycin) — a protein complex that acts as a master regulator of cell growth. When mTOR is constantly active (as it tends to be with modern diets), cells grow and divide aggressively, accumulate damage, and age faster. By periodically inhibiting mTOR, rapamycin mimics the benefits of caloric restriction: enhanced autophagy (cellular cleanup), reduced inflammation, improved stem cell function, and better immune system regulation. It's essentially pressing the cellular 'clean and repair' button.

03 What Does The Research Say?

The Interventions Testing Program (NIA) showed 9-14% lifespan extension in genetically diverse mice — the gold standard in aging research. Multiple studies show improved immune function in elderly humans at low doses (the opposite of what you'd expect from an immunosuppressant). Peter Attia, Matt Kaeberlein, and other prominent longevity researchers have publicly discussed taking rapamycin themselves. The PEARL trial is studying its effects on aging in dogs. Human longevity trials are in early stages. However: at high doses (transplant doses), rapamycin suppresses immunity and increases infection risk. The longevity hypothesis depends on intermittent, low-dose use being safe long-term — which hasn't been definitively proven.

04 Reported Dosages

Transplant dose: 1-5mg daily (continuous — immunosuppressive). Longevity dose (off-label, reported): 3-6mg once weekly or biweekly (intermittent — theoretically not immunosuppressive). Prescription only. Must be prescribed by a doctor. Regular blood monitoring recommended.

05 Side Effects & Risks

At transplant doses: immunosuppression, mouth sores, elevated cholesterol, impaired wound healing. At low intermittent doses: generally well-tolerated in studies, occasional mouth sores. The key concern is whether long-term low-dose use is truly safe — we don't have 20-year human data.

06 Legal Status