Which Form?
Metformin
Moderate
consensus
Available Forms
- Metformin is a prescription drug (brand name Glucophage), not a supplement
- Extended-release (ER) formulations are generally preferred to reduce GI side effects
- It is a biguanide-class medication
Dosage & Timing
Dosage
- 500-2000mg per day for type 2 diabetes (standard clinical dosing)
- For off-label longevity use, lower doses (500-1000mg) are sometimes discussed, though no expert consensus exists on longevity-specific dosing
- The TAME trial uses 1500mg/day
Timing
- Typically taken with meals to reduce GI side effects
- Extended-release formulations are usually taken once daily with dinner
- Attia notes that timing relative to exercise matters — metformin may blunt exercise-induced mitochondrial adaptations
Expert Positions
What Each Expert Says
Huberman covers metformin across 5 videos, ranging from blood glucose regulation to a dedicated Journal Club episode. In his Journal Club with Attia, they critically examine metformin studies, particularly the 2014 Banister study and a newer Danish twin study that cast doubt on metformin's survival advantage. In his longevity supplements AMA, Huberman explicitly states he avoids metformin, berberine, and rapamycin for longevity. He also discusses metformin as a glucose-lowering prescription drug in his hunger and satiety episodes, noting its potency but warning about hypoglycemia risks. A guest episode with David Sinclair touches on metformin as part of Sinclair's personal longevity protocol.
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