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source_867a2a8684634591

# Research Synthesis: Metformin Biomarker Effects — full paper

## Abstract

Evidence-honesty note: The retained evidence has no direct interventional hard-endpoint evidence; indirect, review-level, adjacent, or mechanistic sources are used only to bound interpretation. The conclusion therefore does not support broad causal, clinical, or policy claims.

Metformin, a first-line glucose-lowering age…