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Evidence-Based Supplement Research
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

All 3 studies (including a meta-analysis and two systematic reviews) found statistically significant beneficial effects of L-carnitine supplementation on reducing hemoglobin A1c, with predominantly small effect sizes (mean reductions of -0.16% to -0.37%). The most-studied doses ranged from 1 to 2 g/day in 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: 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). Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Additionally, the meta-analysis reported high heterogeneity (I² = 94%), indicating variability in study results.

Generated Jul 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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