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Evidence-Based Supplement Research
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Big effect

L-carnitine linked to 1.1 kg weight loss in umbrella meta-analysis, but high heterogeneity throws cold water on the finding

This analysis of 3 meta-analyses found a statistically significant average weight loss of about 1.1 kg with L-carnitine, but the extreme variability (I²=90.6%) and low overall evidence strength mean the true effect could be much smaller or even zero.

An umbrella meta-analysis of L-carnitine supplements found a statistically significant average reduction in body weight of about 1.1 kg compared to placebo. However, the results across individual studies were highly inconsistent, with an I² value of 90.6% indicating almost all the variation is due to true differences between studies rather than chance. This weakens the overall confidence in the finding, and the evidence is considered low strength.

Where this fits in the evidence

Pillser has synthesized 4 studies on L-Carnitine for Reduced Body Weight — overall evidence strength: Moderate.

Across all 4 studies, L-carnitine supplementation showed beneficial effects on reduced body weight. The predominant effect size was moderate, with effect sizes ranging from small to large. Doses ranged from 150 to 4000 mg/day in the two studies that reported dose, and effects were typically observed over 6–8 weeks (median study duration 49 days across 2 studies). The evidence primarily involves clinical populations such as individuals with PCOS, overweight/obesity, or diabetes.

The study

The Effect of the L-Carnitine Supplementation on Obesity Indices: An Umbrella Meta-Analysis.

  • Meta-Analysis
  • n = 352
  • 2025-04-28
  • International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition
More on L-CarnitineMore on Reduced Body Weight

This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.

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