Rapamycin and Metformin for Anti-Aging: My Protocol After 2 Years

Two years ago I added rapamycin and metformin to my daily protocol. Not because some longevity influencer told me to — because I read the actual research and decided the risk-reward profile made sense for a 44-year-old man who’s put his body through decades of performance enhancement.

Now, at 46, I have two full years of bloodwork data, subjective experience, and real-world results to share. No theoretical hand-waving. No parroting Peter Attia talking points. Just my personal experience running these two compounds alongside my existing TRT protocol and peptide stack.

Why Rapamycin? The mTOR Story

mTOR (mechanistic target of rapamycin) is the master growth signaling pathway in your cells. When mTOR is activated, your cells grow, divide, and build protein. This is great when you’re training and trying to build muscle. But chronically elevated mTOR signaling is also associated with accelerated aging, increased cancer risk, and cellular senescence.

Rapamycin inhibits mTOR — specifically the mTORC1 complex. In animal studies, it’s one of the most robust life-extension interventions ever discovered. We’re talking 15-25% increases in median lifespan in mice, which is extraordinary. The NIA’s Interventions Testing Program has replicated this across multiple sites and mouse strains.

The human longevity data is still accumulating. We don’t have 30-year randomized controlled trials in healthy humans — that’s just reality. But the mechanistic data, the animal data, and the emerging human data all point in the same direction. Peter Attia, Matt Kaeberlein, and the entire longevity medicine field have converged on rapamycin as the most promising pharmaceutical anti-aging intervention available today.

I decided to stop waiting for perfect data and start collecting my own.

My Rapamycin Protocol

I take rapamycin (sirolimus) at 5-6mg once weekly. This intermittent dosing schedule is critical — you want to pulse-inhibit mTORC1 without chronically suppressing mTORC2, which is what happens at daily immunosuppressive doses used in transplant patients. The weekly pulse gives you the anti-aging mTORC1 inhibition while allowing mTORC2 to recover between doses.

I take it Sunday evening with a high-fat meal (typically after dinner here in Pattaya — usually something with coconut oil or avocado). Fat significantly improves rapamycin absorption — bioavailability roughly doubles compared to taking it fasted.

Key observations after 2 years:

• Skin quality improvement — This was the first thing I noticed, around month 3. My skin texture improved noticeably, and several people commented on it without knowing what I was taking. Rapamycin upregulates collagen production via mTOR inhibition-mediated autophagy
• Reduced frequency of minor illness — Counterintuitively, low-dose rapamycin appears to enhance immune function by promoting immune cell autophagy. A 2014 Novartis study showed improved vaccine response in elderly patients on low-dose rapamycin analogs
• Inflammatory markers down — My hs-CRP dropped from 1.8 to 0.6 over the first year. This is significant for someone with my history of heavy training and compound use
• No muscle loss — This was my biggest concern. At weekly 5-6mg doses alongside my TRT and training, I’ve seen zero negative impact on muscle mass or recovery. The intermittent dosing allows mTOR to fully activate during the training-recovery window
• Lipid profile improvement — My triglycerides dropped roughly 20%. LDL stayed stable. HDL marginally improved

Why Metformin? The AMPK Activator

Metformin is a diabetes drug that activates AMPK (AMP-activated protein kinase) — essentially the opposite signaling pathway to mTOR. When AMPK is activated, your cells switch from growth mode to repair/conservation mode. It enhances mitochondrial efficiency, improves insulin sensitivity, reduces hepatic glucose output, and has anti-inflammatory effects. This dual-pathway targeting of mTOR and AMPK is a perfect demonstration of the Tony Huge Laws of Biochemistry Physics in action—leveraging opposing regulatory systems to achieve a superior homeostatic outcome.

The TAME (Targeting Aging with Metformin) trial is the first FDA-approved clinical trial testing a drug specifically for aging. That tells you how seriously the research community takes metformin’s anti-aging potential.

Epidemiological data from diabetic patients on metformin consistently shows they have lower all-cause mortality than non-diabetic controls. Read that again — people taking metformin for diabetes outlive healthy people not taking it. That’s a striking finding.

My Metformin Protocol

I run metformin at 500mg twice daily (1000mg total) with meals. I specifically take the extended-release (XR) formulation to minimize GI side effects, which are the main complaint with immediate-release metformin.

Key observations:

• Improved fasting glucose — Dropped from 95 mg/dL to 82 mg/dL. Not that 95 was bad, but 82 is optimal
• Better body composition management — Metformin improves nutrient partitioning. I notice it’s easier to stay lean even during periods of higher caloric intake
• Stable energy throughout the day — No blood sugar crashes. The improved insulin sensitivity translates to more even energy levels
• GI adjustment period — The first two weeks were rough. Bloating, loose stools, some nausea. The XR formulation helped, and it resolved completely by week 3. If you can’t tolerate it, berberine at 500mg 3x daily is a solid alternative with a similar AMPK activation profile

The Metformin-Training Controversy

There’s a legitimate concern about metformin blunting the mTOR response to resistance training, potentially reducing muscle hypertrophy. The data is mixed but the concern isn’t baseless. My approach: I skip my morning metformin dose on heavy training days and take it only with dinner. This gives a clean mTOR window for the post-workout anabolic response while still getting the metabolic benefits.

This is especially important if you’re running growth hormone peptides alongside — you want GH and IGF-1 signaling unimpaired around training.

The Synergy: Rapamycin + Metformin Together

Running rapamycin and metformin together creates a complementary anti-aging effect. Rapamycin pulses mTORC1 inhibition weekly while metformin provides continuous AMPK activation daily. Both pathways converge on improved autophagy — your cells’ built-in recycling and repair system. For a deeper dive into activating this process, see my complete autophagy activation protocol.

Think of it this way: rapamycin tells your cells to stop blindly growing and start cleaning house. Metformin provides the energy efficiency for that cleaning process. Together, they push your cellular biology toward a maintenance-and-repair phenotype rather than a growth-and-accumulate phenotype.

The practical result after two years: I look and feel younger than I did at 44 when I started. My bloodwork markers across the board are trending in the right direction. My biological age estimates (using various epigenetic clock services) have consistently shown 5-8 years younger than chronological.

What About NAD+ Precursors?

I run NMN (nicotinamide mononucleotide) at 500mg daily alongside this stack. NAD+ levels decline with age, and restoring them supports mitochondrial function and sirtuin activity — both of which complement the rapamycin/metformin mechanisms. The full anti-aging stack is rapamycin + metformin + NMN + my TRT protocol. Each targets a different aging pathway. For other compounds that target aging via similar or complementary mechanisms, explore the longevity hub.

Sourcing Rapamycin

Getting rapamycin prescribed in the US for anti-aging is still difficult. Most doctors won’t touch it. A handful of longevity-focused physicians will prescribe it off-label if you understand the risk profile and sign appropriate waivers.

Here in Thailand, pharmaceutical-grade sirolimus (Rapamune) is available at pharmacies with a prescription, and getting that prescription is straightforward if you know where to go. This is one of the many reasons I choose to live here — access to compounds that are unnecessarily restricted in the West.

Metformin is even easier — it’s available over the counter in most Thai pharmacies and costs almost nothing. In the US, any doctor should be willing to prescribe it, especially if you present the anti-aging data.

Who Should Consider This Stack?

If you’re under 30 with no metabolic issues, you probably don’t need either compound yet. Focus on the basics — training, nutrition, sleep, stress management.

If you’re over 35, especially if you have a history of performance enhancement that’s put extra stress on your metabolic systems, the rapamycin + metformin stack is worth serious consideration. Add NMN and you’re covering the major mechanistic bases of biological aging.

As always, get comprehensive bloodwork before starting and monitor regularly. This isn’t guesswork — it’s precision medicine applied to the problem of aging. And from where I’m sitting two years in, the results speak for themselves.

Interesting Perspectives

While the core anti-aging mechanisms of rapamycin (mTOR inhibition) and metformin (AMPK activation) are well-established, the research landscape reveals some unconventional and emerging applications that broaden their potential. For instance, metformin’s anti-inflammatory and immunometabolic reprogramming effects are being investigated in chronic inflammatory skin conditions like hidradenitis suppurativa, suggesting benefits beyond metabolic syndrome. There’s also growing preclinical interest in metformin’s potential role in oncology, such as in prostate cancer, where it may influence tumor metabolism and growth pathways. Furthermore, the concept of combining mTOR-targeting strategies with other longevity pathways, like those addressed by mTOR-independent autophagy inducers or caloric restriction mimetics, represents a frontier in creating multi-targeted aging interventions. This aligns with a systems-based approach to longevity, moving beyond single-pathway fixes.

Citations & References

Related Articles

• Rapamycin for Anti-Aging: Why I Take the Most Controversial Longevity Drug
• Niclosamide: The Antiparasitic Drug With Shocking Longevity Potential (another mTOR-influencing compound)
• Acarbose: The Longevity Drug Hiding in Diabetes Clinics (an alternative/complementary metabolic agent)
• Trehalose: The mTOR-Independent Autophagy Inducer
• Oxaloacetate: The Caloric Restriction Mimetic
• Taurine: The Longevity Amino Acid Backed by Science