mTOR Sabbatical — Advanced Longevity Protocol
Three-pathway mTOR inhibition combining Rapamycin, Acarbose, and Berberine for advanced longevity seekers. Targets the mTOR/AMPK axis with complementary mechanisms for caloric restriction mimicry without caloric restriction.
Daily Schedule
Timing and dosage for each step
Weekly
With meals
With meals
Protocol Overview
mTOR (mechanistic target of rapamycin) is the master regulator of cellular growth, metabolism, and ageing. Chronic mTOR overactivation — driven by excess nutrients, sedentary behaviour, and ageing itself — accelerates cellular senescence, suppresses autophagy, and drives the hallmarks of ageing.
This protocol targets mTOR through three distinct mechanisms simultaneously, creating synergistic inhibition without the immunosuppression risk of high-dose rapamycin monotherapy.
The Three-Pathway Approach
Rapamycin directly inhibits mTORC1 by binding FKBP12, preventing downstream signalling through S6K1 and 4E-BP1. This is the primary mTOR inhibitor with the strongest longevity evidence — the ITP programme demonstrated 9–23% median lifespan extension in mice across multiple cohorts.
Acarbose inhibits intestinal alpha-glucosidases, reducing postprandial glucose spikes and chronically lowering insulin signalling. Since insulin is a primary mTOR activator via PI3K/Akt, acarbose provides indirect mTOR inhibition through glycaemic modulation. The ITP demonstrated 22% lifespan extension in male mice — comparable to rapamycin through a complementary mechanism.
Berberine activates AMPK (the cellular energy sensor that directly inhibits mTOR) and has demonstrated comparable glucose-lowering efficacy to metformin in head-to-head trials. AMPK activation is the most physiological mTOR inhibition pathway.
Dosing Protocol
| Compound | Dose | Timing | Notes |
|---|---|---|---|
| Rapamycin | 5–6mg | Once weekly | With fatty meal |
| Acarbose | 25–50mg | With first bite of carbohydrate meals | 3x daily with carb-containing meals |
| Berberine | 500mg | 3x daily with meals | Split dosing for bioavailability |
Cycle: 8 weeks on → 4 weeks off → repeat. The off-cycle maintains mTOR sensitivity and reduces immunosuppression concerns.
Prerequisites and Safety
This protocol is for advanced biohackers with baseline bloodwork established. Before starting, obtain: fasting glucose, HbA1c, lipid panel, complete metabolic panel, and ideally rapamycin trough level after first dose.
Rapamycin is prescription-only in most jurisdictions. Work with a longevity physician. Acarbose causes significant GI side effects (flatulence, loose stools) during carbohydrate-containing meals — start at 25mg and titrate slowly.
Absolute contraindications for rapamycin: Active infection, immunocompromised state, live vaccine schedule, planned surgery within 3 months.
Monitoring
Every 8 weeks: fasting glucose, lipids, CBC (check for rapamycin-related effects on platelets/lymphocytes), wound healing assessment.