L-Carnitine and Reduced Systolic Blood Pressure

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

Across 3 studies, none found a statistically significant beneficial effect of L-carnitine supplementation on systolic blood pressure. All studies reported small effect sizes but neutral results. The median study duration was 56 days, and the only study that specified a dose used 1000 mg/day of L-carnitine tartrate.

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. None of the included studies reached statistical significance for L-carnitine alone on systolic blood pressure. The meta-analysis reported high heterogeneity (I2=85%), indicating variability across trials. One RCT found that L-carnitine combined with synbiotic reduced SBP, but L-carnitine monotherapy did not.

Generated Jul 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 papersPopulation:

The Effects of L-Carnitine Supplementation on Blood Pressure in Adults: A Systematic Review and Dose-response Meta-analysis.
- 2024-02
- Meta-Analysis · n = 1,412
- Clinical therapeutics 46(2)
- - Shiva Rahimipour Anaraki
  - Yasaman Aali
  - Mahlagha Nikbaf-Shandiz
  - Niloufar Rasaei
  - Alireza Khadem
  - Hossein Bahari
  - Zeinab Khalse
  - Samira Rastgoo
  - Farideh Shiraseb
  - Omid Asbaghi
- PubMed: 38101999
- DOI: 10.1016/j.clinthera.2023.11.002
2 Insights on
- Reduced Systolic Blood Pressure
- High evidence
- Adults
L-Carnitine supplementation did not have a significant effect on systolic blood pressure (SBP) (mm Hg) (weighted mean difference [WMD] = -1.22 mm Hg, 95% CI: -3.79, 1.35; P = 0.352; I2 = 85.0%, P < 0.001)
Effect
Neutral
Effect size
Small
Significant
No
Modulatory Effects of Multi-species/Multi-strain Synbiotic and L-carnitine Concomitant Supplementation on Atherogenic-Indices, Body Composition, Visceral Obesity, and Appetite in Metabolically Healthy Women with Obesity: A Double-Blind Randomized Controlled Clinical Trial.
- 2025-02-08
- RCT
- Probiotics and antimicrobial proteins 17(6)
- - Farnoush Fallah
  - Reza Mahdavi
- PubMed: 39921845
- DOI: 10.1007/s12602-025-10460-2
12 Insights on
- Reduced Systolic Blood Pressure
- High evidence
- Rigorous Journal
- Clinical
L-carnitine + synbiotic co-supplementation led to a significantly greater reduction in ... systolic blood pressure (SBP) compared to L-carnitine mono-therapy.
Effect
Neutral
Effect size
Small
Significant
No
Dose
L-carnitine-tartrate 2 × 500 mg/day (monotherapy group)
Effects of L-carnitine supplementation on lipid profile in adult patients under hemodialysis: a systematic review and meta-analysis of RCTs.
- 2024-12-02
- Systematic Review · n = 28
- Frontiers in medicine 11
- - Mehdi Karimi
  - Samira Pirzad
  - Seyed Morteza Ali Pourfaraji
  - Peyvand Parhizkar Roudsari
  - Niyousha Shirsalimi
  - Sajad Ahmadizad
- PubMed: 39687901
- DOI: 10.3389/fmed.2024.1454921
6 Insights on
- Reduced Systolic Blood Pressure
- High evidence
- Clinical
systolic BP (SMD: 0.055; 95% CI, -0.110 to 0.220; P = 0.43)
Effect
Neutral
Effect size
Small
Significant
No

L-Carnitine and Reduced Systolic Blood Pressure

The Effects of L-Carnitine Supplementation on Blood Pressure in Adults: A Systematic Review and Dose-response Meta-analysis.

Modulatory Effects of Multi-species/Multi-strain Synbiotic and L-carnitine Concomitant Supplementation on Atherogenic-Indices, Body Composition, Visceral Obesity, and Appetite in Metabolically Healthy Women with Obesity: A Double-Blind Randomized Controlled Clinical Trial.

Effects of L-carnitine supplementation on lipid profile in adult patients under hemodialysis: a systematic review and meta-analysis of RCTs.