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Evidence-Based Supplement Research
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L-Carnitine and Reduced Hemoglobin A1c

Research synthesisModerate evidenceSmall effect3 studies · 3 beneficial · 0 neutral · 0 harmful

Across 3 studies, all reported beneficial effects of L-carnitine on reducing hemoglobin A1c, with predominantly small effect sizes. The most-studied dose range is 1-2 g/day, and the evidence primarily comes from adults with type 2 diabetes or impaired glucose tolerance.

  • Effective dose range: 1-2 g/day
  • Studied populations: adults with type 2 diabetes or impaired glucose tolerance

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Additionally, heterogeneity was high (I²=94%) in the largest meta-analysis, indicating inconsistency across studies.

Generated Jun 12, 2026
Doses used in studies
  • g/day: 1–2 (median 1.5, IQR 1.25–1.75) — 2 studies
3 of 3 papers
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