Vol. I · No. 33
Thursday, August 13, 2026
Issue: Summer · 2026
Established · MMXXVI
— The evidence base for longevity medicine —
Indexed by PubMed · CTG · Cochrane
Editorial team · geroevidence.com
Subscription · app.geroevidence.com

TAME trial 2026 update: where the metformin longevity trial stands

The Targeting Aging with Metformin trial is the most significant longevity trial currently running. Here is the current enrollment status, timeline, and what interim signals look like.

By Geroevidence editorial team·Published 19 July 2026·Category clinical trials·11 min read
§ Overview

The Targeting Aging with Metformin trial is the most significant longevity trial currently running. Here is the current enrollment status, timeline, and what interim signals look like.

Evidence tier: Pending. Drug class: mTOR / AMPK. This profile synthesizes the published human trial evidence. The full profile with all indexed papers, active trial alerts, and tier history is available to subscribers.

§ Key human evidence
Trial design
TAME — NCT03077477
n=3,000 target
Adults 65–79 years without diabetes. Metformin 500mg twice daily versus placebo for 6 years. Primary composite endpoint: time to first occurrence of a composite of incident diabetes, MCI/dementia, CVD, cancer, physical disability, or all-cause mortality. This composite endpoint — grouping multiple age-related conditions — is explicitly designed to test whether metformin targets aging as a process, not individual diseases.
Enrollment update
TAME enrollment status, mid-2026
n=~2,400 enrolled
As of mid-2026 TAME is approximately 80% enrolled across 14 US sites. Full enrollment completion expected late 2026. Primary endpoint data collection will run through approximately 2030. An interim analysis is planned at the 50% endpoint milestone but is unlikely to be powered to change the trial's blinding status. Results expected 2030–2031 for primary analysis.
Biomarker sub-study
TAME biomarker sub-study
n=~300
A subset of TAME participants will have comprehensive multi-omic biological aging assessments at baseline and follow-up including epigenetic clocks, proteomics, metabolomics, and immune profiling. This is intended to validate whether these surrogate biomarkers track with the composite aging endpoint — potentially the most important methodological contribution of the trial beyond the primary result.
§ The honest clinical position

Every Geroevidence profile ends with an honest assessment of what the evidence supports and what it does not. This intervention is rated Pending based on the published human trial evidence indexed above.

The full honest clinical assessment — including evidence tier rationale, key limitations, and what trials would be needed to upgrade the tier — is in the subscriber profile. The summary: the mechanistic basis is coherent and human trial data is available; the specific clinical applications and limitations are detailed in the full profile.

This information is provided for educational reference only and does not constitute medical advice or a treatment recommendation.

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