Effect of lysine, vitamin B(6), and carnitine supplementation on the lipid profile of male patients with hypertriglyceridemia: a 12-week, open-label, randomized, placebo-controlled trial

Clin Ther. 2012 Aug;34(8):1674-82. doi: 10.1016/j.clinthera.2012.06.019. Epub 2012 Jul 20.


Background: Fat metabolism is known to be altered in hypertriglyceridemia. Fat oxidation requires carnitine, which can be obtained either from the diet (animal or dairy products) or through synthesis in the body using both lysine and vitamin B(6).

Objective: The goal of this study was to investigate the effect of lysine, vitamin B(6), and carnitine supplementation on both glycemia and the lipid profiles, specifically triglyceride (TG) levels, in men with hypertriglyceridemia.

Methods: This 12-week, randomized, placebo-controlled clinical trial was conducted at a Lebanese medical center. A total of 85 hypertriglyceridemic (TG> 150 mg/dL) male patients were randomized to 1 of 5 groups and given supplements of lysine (1 g/d), vitamin B(6) (50 mg/d), lysine (1 g/d) + vitamin B(6) (50 mg/d), carnitine (1 g/d), or placebo for 12 weeks. The lipid profile (TG, total cholesterol, LDL-C, and HDL-C) and fasting plasma glucose levels were assessed at baseline and at 6 and 12 weeks.

Results: Adults (∼50 years) Lebanese males from a low socioeconomic status in Beirut were given the appropriate supplements. Vitamin B(6) supplementation was associated with a significant reduction in total cholesterol and HDL-C of ∼10%. In addition, plasma TG was reduced by 36.6 mg/dL at 6 weeks, whereas levels in the placebo group increased by 18 mg/dL; this difference failed to reach statistical significance. No major changes in the lipid profile were observed in the lysine and carnitine groups or when lysine was added to vitamin B(6).

Conclusion: Vitamin B(6) supplementation in these male patients with hypertriglyceridemia reduced plasma total cholesterol and HDL-C concentrations.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Aged
  • Analysis of Variance
  • Biomarkers / blood
  • Blood Glucose / metabolism
  • Carnitine / therapeutic use*
  • Cholesterol / blood
  • Cholesterol, HDL / blood
  • Cholesterol, LDL / blood
  • Dietary Supplements*
  • Drug Combinations
  • Humans
  • Hypertriglyceridemia / blood
  • Hypertriglyceridemia / drug therapy*
  • Hypolipidemic Agents / therapeutic use*
  • Lebanon
  • Lipids / blood*
  • Lysine / therapeutic use*
  • Male
  • Middle Aged
  • Time Factors
  • Treatment Outcome
  • Triglycerides / blood
  • Vitamin B 6 / therapeutic use*


  • Biomarkers
  • Blood Glucose
  • Cholesterol, HDL
  • Cholesterol, LDL
  • Drug Combinations
  • Hypolipidemic Agents
  • Lipids
  • Triglycerides
  • Vitamin B 6
  • Cholesterol
  • Lysine
  • Carnitine