Garlic powder intake and cardiovascular risk factors: A meta-analysis of randomized controlled clinical trials

Jin Sook Kwak, Ji Yeon Kim, Ju Eun Paek, You Jin Lee, Haeng Ran Kim, Dong Sik Park, Oran Kwon

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Background/Objectives: Although preclinical studies suggest that garlic has potential preventive effects on cardiovascular disease (CVD) risk factors, clinical trials and reports from systematic reviews or meta-analyses present inconsistent results. The contradiction might be attributed to variations in the manufacturing process that can markedly influence the composition of garlic products. To investigate this issue further, we performed a meta-analysis of the effects of garlic powder on CVD risk factors.

Materials/Methods: We searched PubMed, Cochrane, Science Direct and EMBASE through May 2014. A random-effects meta-analysis was performed on 22 trials reporting total cholesterol (TC), 17 trials reporting LDL cholesterol (LDL-C), 18 trials reporting HDL cholesterol (HDL-C), 4 trials reporting fasting blood glucose (FBG), 9 trials reporting systolic blood pressure (SBP) and 10 trials reporting diastolic blood pressure (DBP).

Results: The overall garlic powder intake significantly reduced blood TC and LDL-C by -0.41 mmol/L (95% confidence interval [CI], -0.69, −0.12) (-15.83 mg/dL [95% CI, −26.64, −4.63]) and −0.21 mmol/L (95% CI, −0.40, −0.03) (−8.11 mg/dL [95% CI, −15.44, −1.16]), respectively. The mean difference in the reduction of FBG levels was -0.96 mmol/L (95% CI, −1.91, −0.01) (−17.30 mg/dL [95% CI, −34.41, −0.18]). Evidence for SBP and DBP reduction in the garlic supplementation group was also demonstrated by decreases of −4.34 mmHg (95% CI, −8.38, −0.29) and -2.36 mmHg (95% CI, −4.56, −0.15), respectively.

Conclusions: This meta-analysis provides consistent evidence that garlic powder intake reduces the CVD risk factors of TC, LDL-C, FBG and BP.

Original languageEnglish
Pages (from-to)644-654
Number of pages11
JournalNutrition Research and Practice
Issue number6
StatePublished - 1 Dec 2014

Bibliographical note

Publisher Copyright:
© 2014 The Korean Nutrition Society and the Korean Society of Community Nutrition.


  • Allium sativum
  • CVD risk factor
  • Garlic
  • Meta-analysis
  • Systematic review


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