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source_d29b0f1b26104485

# Alpha memo: metformin exercise protocol mismatch
**One-sentence alpha:** Across two trials, metformin combined with exercise may travel as a positive signal for fasting insulin secretion in prediabetes but shows no additive effect on HbA1c in type 2 diabetes, suggesting the interaction splits by population and endpoint rather than uniformly helping or hindering.

**Receipt 1:** "Metformin Enhanc…