Metformin
Also known as: Glucophage · Fortamet · Glumetza
The world's most prescribed diabetes medication, now studied as a potential anti-aging drug through AMPK activation, mTOR inhibition, and mitochondrial effects.
Overview
Metformin is a biguanide medication that has been used for over 60 years to treat type 2 diabetes. It has emerged as one of the most promising candidates for a true "anti-aging" drug, based on epidemiological data showing that diabetic patients on metformin actually live longer than non-diabetic controls — a remarkable finding that sparked the landmark TAME (Targeting Aging with Metformin) clinical trial. Metformin's anti-aging mechanisms are multifaceted: it activates AMPK (the cellular energy sensor), inhibits mTOR (a key aging pathway), reduces insulin and IGF-1 signaling, decreases inflammation, improves mitochondrial function, and may activate sirtuins. Observational studies consistently show reduced cancer incidence, cardiovascular disease, and all-cause mortality in metformin users. However, it's important to note potential downsides — metformin may blunt some exercise adaptations (particularly mitochondrial biogenesis and hypertrophy responses), can deplete vitamin B12, and may cause GI side effects.
Many longevity practitioners use metformin strategically, timing it away from exercise sessions.
Mechanism of Action
Primarily inhibits mitochondrial complex I, increasing AMP:ATP ratio and activating AMPK. AMPK activation inhibits mTOR (reducing cell growth signaling), increases autophagy, enhances fatty acid oxidation, and improves insulin sensitivity. Also reduces hepatic glucose production, decreases intestinal glucose absorption, and modulates the gut microbiome. May activate SIRT1 and reduce NF-κB inflammatory signaling.
Key Benefits
Potential Side Effects
Common Stacks
This peptide is commonly combined with the following compounds for synergistic effects:
Known Interactions
The following interactions have been documented for Metformin. Always consult a healthcare professional before combining compounds.
Synergistic (6)
MK-677 can raise blood glucose and insulin. Metformin helps counteract this by improving insulin sensitivity, making the combination more metabolically favorable.
Both activate AMPK to improve metabolic health. MOTS-c is a mitochondrial-derived peptide while metformin works through complex I inhibition. Complementary AMPK activation.
Both are cornerstone longevity compounds. Metformin activates AMPK while rapamycin inhibits mTOR. Together they shift the body toward cellular repair and autophagy.
Metformin activates AMPK and improves metabolic health while NAD+/NMN replenishes cellular energy currency. Complementary cellular health support.
Metformin improves insulin sensitivity which can enhance testosterone's metabolic benefits. Common combination in men's health optimization protocols.
Both improve metabolic health through different mechanisms. Semaglutide (GLP-1) + Metformin (AMPK) is a well-studied combination for type 2 diabetes and weight management.
Scientific References
Quick Reference
Typical Dose
500-1000 mg/day (longevity); 1500-2000 mg/day (diabetes)
Frequency
1-2 times daily with meals; extended-release preferred
Route
Oral tablet (immediate or extended release)
Half-Life
~6.2 hours
Cycle Length
Ongoing; some cycle off during intense training periods
FDA Status
FDA approved for type 2 diabetes; off-label for longevity/PCOS
Need to calculate dosing?
Use our reconstitution calculator to determine exact syringe measurements.
Open CalculatorThis information is for educational purposes only. Consult a qualified healthcare professional before using any peptide. Dosing information reflects commonly reported protocols and may not be appropriate for everyone.
Related Peptides in Longevity & Anti-Aging
Rapamycin
The only compound proven to extend lifespan in every organism tested, from yeast to mammals, through inhibition of the mTOR pathway — the master regulator of cellular aging.
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NAD+ precursors that restore declining cellular energy levels, activate sirtuins and PARPs, and support DNA repair — central to the biology of aging.
Read moreResveratrol
A polyphenol compound found in red wine and grapes that activates SIRT1, enhances mitochondrial function, and provides cardiovascular and neuroprotective benefits.
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