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Evidence-Based Supplement Research
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L-Carnitine and Reduced Systolic Blood Pressure

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

Across 3 studies, all reported neutral effects of L-carnitine on systolic blood pressure, with small effect sizes and no statistically significant findings. The evidence includes a meta-analysis of 1,412 adults and two smaller clinical studies (metabolically healthy women with obesity and hemodialysis patients). The median study duration was 56 days, but only one study specified a dose (L-carnitine-tartrate 1000 mg/day).

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Many of the included studies did not reach statistical significance, reinforcing a null effect. The meta-analysis showed high heterogeneity (I² = 85%), suggesting variability across underlying trials. One RCT found that L-carnitine alone did not reduce SBP, but co-supplementation with synbiotic did, indicating potential for combination effects.

Generated Jun 12, 2026
Doses used in studies
  • Tartrate · mg/day: 1,000 (median 1,000, IQR 1,000–1,000) — 1 study
Time to effect
Median: 8 weeks · IQR 8 weeks–8 weeks · Range 8 weeks–8 weeks — Reported in 1 of 3 studies
3 of 3 papers
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