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Evidence-Based Supplement Research
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L-Carnitine and Reduced Malondialdehyde

Research synthesisLow evidenceSmall effect4 studies · 2 beneficial · 2 neutral · 0 harmful

Across 4 studies, 2 reported beneficial effects of L-carnitine on reducing malondialdehyde (MDA), with the predominant effect size being small. The two beneficial studies included a large meta-analysis (n=3255, p=0.001) and a small RCT in women with migraine; the two neutral studies were smaller RCTs in critically ill septic and obese female patients. The median study duration was 56 days (8 weeks), and doses ranged from 500 mg/day to 3 g/day, primarily in clinical adult populations.

Caveats: Evidence base is small (only 4 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance — effect may be smaller than the predominant direction suggests. The two beneficial studies differed in design (meta-analysis vs. small RCT in migraine patients), and the neutral studies were in distinct clinical populations (sepsis, obesity), limiting generalizability.

Generated Jul 12, 2026
Doses used in studies
  • mg/day: 500–1,000 (median 750, IQR 625–875) — 2 studies
  • g/day: 3 (median 3, IQR 3–3) — 1 study
Time to effect
Median: 8 weeks · IQR 4.5 weeks–10 weeks · Range 7 days–2.8 months — Reported in 3 of 4 studies
4 of 4 papers
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