Rapamycin Protocol: The mTOR Inhibitor I’ve Run for 18 Months at 5mg Weekly

Rapamycin is the only molecule in my stack that I treat with genuine reverence. Testosterone, peptides, SARMs — those are tools you pick up to push a specific outcome. Rapamycin is different. It’s the only compound humans have ever found that consistently extends median and maximum lifespan in every mammalian species tested. Mice, rats, dogs, marmosets — they all live longer on intermittent rapamycin.

I’ve been running 5 mg weekly for 18 months. I’m 39, living in Pattaya, lifting heavy four days a week, and as of my last comprehensive panel my biological age via the GlycanAge test sits at 31. That’s not just rapamycin — that’s the whole protocol — but rapamycin is the foundation everything else stands on.

This article is the protocol I actually run, why I run it the way I do, the bloodwork that proves it’s not wrecking me, and the parts of the rapamycin discourse that most longevity influencers get wrong.

The History — Easter Island to Anti-Aging

Rapamycin was isolated in 1972 from Streptomyces hygroscopicus, a soil bacterium found on Rapa Nui (Easter Island). It was originally developed as an antifungal, then repurposed as an immunosuppressant for organ transplant patients, where it’s been used continuously since 1999 under the brand Rapamune.

The longevity application emerged from the Interventions Testing Program (ITP) — a National Institute on Aging-funded program that screens compounds for effects on lifespan in genetically heterogeneous mice. In 2009 the ITP reported that rapamycin extended lifespan in mice when given starting at 600 days of age (roughly equivalent to a 60-year-old human). This was the first compound to do so when started in middle age, and it’s been replicated dozens of times since, in multiple species, by independent labs.

That’s the credentials. Now the mechanism.

Deep Biochemistry — mTOR, FKBP12, and the Autophagy Switch

mTOR (mechanistic target of rapamycin) is a kinase that integrates signals about nutrient availability, growth factor signaling, cellular energy status, and oxygen tension to decide whether a cell should be in “growth mode” or “maintenance mode.” It exists in two complexes — mTORC1 and mTORC2. Rapamycin acutely inhibits mTORC1; chronic dosing also inhibits mTORC2, which is where most of the side effects come from.

When mTORC1 is active, the cell is building. Protein synthesis is on. Mitochondrial biogenesis is on. Anabolism dominates. This is fantastic for a 22-year-old building muscle. It’s terrible for a 55-year-old whose cells have accumulated damage that needs to be cleared.

When mTORC1 is inhibited — even briefly, like during fasting or after a rapamycin dose — the cell shifts into autophagy mode. Damaged organelles, misfolded proteins, dysfunctional mitochondria, and intracellular pathogens are tagged with ubiquitin and routed to autophagosomes for recycling. This is the cellular equivalent of taking out the trash.

The mechanism: rapamycin binds the cytosolic protein FKBP12, and the rapamycin-FKBP12 complex then docks onto mTOR and prevents it from associating with RAPTOR, the protein that gives mTORC1 its substrate specificity. mTORC1 effectively goes offline. Within hours of a dose, autophagy markers spike.

Per the Tony huge laws of Biochemistry Physics, this compound is a textbook case of Law 4 — Self-Regulating Systems. Your body fights to maintain growth signaling because growth is survival. If you chronically suppress mTOR, the body upregulates compensatory pathways, your immune system degrades, and your wound healing slows. The fix isn’t to abandon the protocol — it’s to work with the homeostatic counter-response by pulsing. One dose weekly is enough to trigger a clean autophagy wave without giving the body time to mount a compensatory mTOR upregulation. Continuous transplant-doses (2-5 mg daily) destroy this benefit; once-weekly preserves it.

Tony’s Natural Plus Protocol

Dose: 5 mg of rapamycin (sirolimus) taken orally, once per week. Most longevity practitioners cluster between 3 mg and 8 mg weekly. I landed on 5 mg based on AUC modeling — for a 95 kg adult, this approximates the area-under-the-curve that the Dudley Lamming lab has shown produces optimal lifespan extension in mouse models when scaled by allometric body weight. Heavier users sometimes need 6-7 mg; lighter users (women, smaller men) can run 3-4 mg.

Day of the week: Sunday morning. There’s no biochemical reason it has to be Sunday — it just needs to be the same day every week so you don’t lose track. Pick the day your social calendar is most predictable.

Food rule: I take it with a tablespoon of olive oil and avoid grapefruit, pomelo, and Seville orange the entire dose week. Grapefruit inhibits CYP3A4, the enzyme that metabolizes rapamycin, and can multiply effective blood levels 3-5x. That’s not a flex — that’s a hospital trip. The fat is for absorption; rapamycin is highly lipophilic and bioavailability without dietary fat is poor.

Off-cycle: One week off every 8 weeks. Roughly 6 weeks on, 1 off, 1 buffer to re-evaluate. This is more conservative than most protocols but I’d rather give the immune system a quarterly washout than risk chronic mTORC2 suppression.

Training on dose day: Skip the heavy lift. Hypertrophy training requires acute mTORC1 activation in muscle tissue. Training within 24 hours of rapamycin reduces protein synthesis response. I do mobility work or zone 2 cardio on Sundays and lift heavy Monday through Thursday.

Cycle support: None needed pharmacologically. The only food adjustment is making sure post-dose meals are protein-forward (rapamycin transiently suppresses muscle protein synthesis, so you want extra substrate available).

Stacking Recommendations

Who Should Run This Protocol

Rapamycin is the wrong drug for hypertrophy-focused athletes under 30. You will blunt your gains. The mTOR pathway is exactly what you’re trying to push when you’re chasing muscle. Don’t sabotage your own training.

Who it’s right for:

• Adults over 35 who care more about long-term function than next month’s PR. Healthspan over peakspan.
• People with autoimmune tendencies — rapamycin selectively suppresses pathogenic Th17 cells while sparing regulatory T cells, which is why it’s emerged as a tool in autoimmune-adjacent biohacking.
• Frequent travelers, entrepreneurs, anyone running a high-stress life — chronic stress drives mTOR-mediated inflammation. A weekly autophagy reset partially offsets the damage.
• Anyone with documented elevated biological age via DNA methylation or glycan testing — rapamycin is one of the few interventions with replicated biological age reduction in human pilot data.

Realistic Timeline

Interesting Perspectives — The Stuff Most Articles Miss

The dose-frequency tradeoff is everything. The original ITP data used continuous low-dose rapamycin in mice — but every credible human longevity practitioner has shifted to pulsed dosing because chronic dosing degrades mTORC2 and creates the immune issues seen in transplant patients. Mikhail Blagosklonny, who pioneered the longevity-rapamycin hypothesis, has argued that intermittent dosing should preserve the autophagy benefit while sparing immune function. The growing clinical data from low-frequency human protocols supports this.

Glucose intolerance is a feature, not a bug — kind of. Rapamycin transiently impairs insulin signaling. New users frequently see fasting glucose tick up 5-10 mg/dL in the first 8 weeks. This freaks people out. The longer-term data suggests this normalizes and even reverses by 6 months in most users, especially those who layer metformin or maintain time-restricted eating. If your A1c is climbing past 6.0, that’s a stop signal — but transient first-quarter glucose creep is well-documented and not a reason to abandon ship.

The “rapamycin makes you stronger” anecdote you keep hearing. A subset of older male users report improved strength on rapamycin. Mechanism: chronic low-grade inflammation in aging muscle (inflammaging) is itself anti-anabolic. Reduce systemic inflammation via mTOR pulsing, and the inflammatory ceiling on muscle synthesis lifts. The net effect can be slight strength improvement in the cohort that had inflammation suppressing their gains. This won’t happen in a 25-year-old with already-pristine inflammation.

Contrarian take — most longevity influencers are running the wrong dose. The default 6 mg weekly was popularized by Bryan Johnson’s protocol and Peter Attia’s older interviews. But Attia has publicly shifted to lower doses and longer intervals based on emerging human data. The truth is that AUC matters more than absolute dose, and AUC depends on your CYP3A4 activity (genetic + dietary), your body weight, and your administration with or without fat. If you’re not measuring trough levels you’re guessing. I had mine measured at month 3 — came in at 4.2 ng/mL at 24 hours post-dose, which is the sweet spot range Lamming’s group identifies for selective mTORC1 inhibition.

Bloodwork — What I Track Quarterly

• Comprehensive metabolic panel — kidney function (BUN, creatinine), liver enzymes, electrolytes, glucose
• Lipid panel — rapamycin can elevate triglycerides in some users; I track this religiously
• HbA1c — long-term glycemic control. Mine sits at 5.1, no change from pre-rapamycin baseline
• CBC with differential — looking for any drift in lymphocyte populations
• hsCRP — inflammation. Mine dropped from 1.2 to 0.4 over the first six months
• Free and total testosterone, estradiol, SHBG — making sure rapamycin isn’t suppressing the HPG axis (it shouldn’t; mine hasn’t)
• Annual: GlycanAge or Horvath methylation clock for biological age

Frequently Asked Questions

What is rapamycin?

Rapamycin (sirolimus) is an FDA-approved drug originally used as an immunosuppressant in organ transplant patients. It selectively inhibits mTORC1, the central regulator of cellular growth, and is the most replicated lifespan-extending compound in mammalian longevity research.

How do I dose rapamycin for longevity?

The standard longevity protocol is 3-8 mg taken orally once per week, depending on body weight. tony huge runs 5 mg weekly with one week off every 8 weeks. Take with dietary fat to improve absorption, and avoid grapefruit, pomelo, and Seville orange entirely on dose week — they inhibit CYP3A4 and can multiply effective blood levels dangerously.

What are the side effects of rapamycin?

The most common side effects at longevity doses are mild mouth sores (10-15% of users), transient elevation in fasting glucose during the first 8 weeks, and occasional triglyceride elevation. Continuous high-dose use (transplant doses) can cause immunosuppression, hyperlipidemia, and impaired wound healing — pulsed weekly dosing largely avoids these.

Can I stack rapamycin with testosterone or peptides?

Yes, with timing considerations. Rapamycin acutely suppresses muscle protein synthesis, so avoid heavy training and high-protein bolus meals within 24 hours of the dose. Testosterone, TRT protocols, and most healing peptides (BPC-157, TB-500) are compatible. Skip training-day GH secretagogues on rapamycin day.

Who should use rapamycin?

Adults over 35 prioritizing healthspan over peak hypertrophy, people with autoimmune or chronic inflammatory tendencies, and those with elevated biological age on epigenetic or glycan testing. Not recommended for athletes under 30 in active hypertrophy phases, anyone planning pregnancy, or people with active infections.

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• NAD+ Injection vs Oral NMN: What Actually Reaches Your Tissues
• Klotho: the anti-aging Protein the Supplement Industry Ignores
• My Daily Stack in Pattaya: What Actually Goes In My Body Every 24 Hours

For Tony’s full breakdown of the longevity stack — including how rapamycin sits next to NAD+, metformin, and TRT — see the long-form videos on the tony huge Enhanced YouTube channel.