Skip to main content
Evidence-Based Supplement Research
Evidence-Based Supplement Research
Pillser
Search
Sign UpLog In

L-Carnitine and Reduced Body Weight

Research synthesisModerate evidenceModerate effect4 studies · 4 beneficial · 0 neutral · 0 harmful

Across 4 studies, all reported beneficial effects of L-carnitine supplementation on reducing body weight, with effect sizes ranging from small to large and a predominant moderate effect. The most-studied dose was 3000 mg/day, and effects were typically observed in clinical populations such as women with PCOS or individuals with overweight/obesity. Median study duration was 49 days (7 weeks), suggesting effects may appear within 6-8 weeks of supplementation.

  • Effective dose range: 150 to 4000 mg/day, with a common dose of 3000 mg/day
  • Studied populations: clinical populations including patients with PCOS, people with overweight/obesity, and individuals with impaired glucose tolerance or diabetes

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 4 studies) — conclusions should be considered preliminary. Most studies lacked specific detail on form, with only one specifying l-carnitine form, so effects may vary by formulation not captured here.

Generated Jul 12, 2026
Doses used in studies
  • L-Carnitine · mg/day: 3,000 (median 3,000, IQR 3,000–3,000) — 1 study
  • mg/day: 150–4,000 (median 2,075, IQR 150–4,000) — 1 study
Time to effect
Median: 7 weeks · IQR 6.5 weeks–7.5 weeks · Range 6 weeks–8 weeks — Reported in 2 of 4 studies
4 of 4 papers
Back to top