The effects of alpha-lipoic acid supplementation on glucose control and lipid profiles among patients with metabolic diseases: A systematic review and meta-analysis of randomized controlled trials

      Highlights

      • Alpha-lipoic acid (ALA) supplementation on metabolic profiles in metabolic diseases was evaluated.
      • ALA supplementation in metabolic diseases improved glycemic control.
      • ALA supplementation decreased triglycerides, total- and low density lipoprotein-cholesterol levels.

      Abstract

      Objective

      This systematic review and meta-analysis of randomized controlled trials (RCTs) was performed to summarize the effect of alpha-lipoic acid (ALA) supplementation on glycemic control and lipid profiles among patients with metabolic diseases.

      Methods

      We searched the following databases till October 2017: MEDLINE, EMBASE, Web of Science and Cochrane Central Register of Controlled Trials. The relevant data were extracted and assessed for quality of the studies according to the Cochrane risk of bias tool. Data were pooled using the inverse variance method and expressed as standardized mean difference (SMD) with 95% confidence intervals (95% CI). Heterogeneity between studies was assessed by the Cochran Q statistic and I-squared tests (I2). Twenty-four studies were included in the meta-analyses.

      Results

      The findings of this meta-analysis showed that ALA supplementation among patients with metabolic diseases significantly decreased fasting glucose (SMD -0.54; 95% CI, −0.89, –0.19; P = 0.003), insulin (SMD –1.01; 95% CI, −1.70, −0.31; P = 0.006), homeostasis model assessment of insulin resistance (SMD -0.76; 95% CI, −1.15, –0.36; P < 0.001) and hemoglobin A1c (SMD –1.22; 95% CI, −2.01, –0.44; P = 0.002), triglycerides (SMD –0.58; 95% CI, −1.00, −0.16; P = 0.006), total- (SMD –0.64; 95% CI, −1.01, −0.27; P = 0.001), low density lipoprotein-cholesterol (SMD –0.44; 95% CI, −0.76, −0.11; P = 0.008). We found no detrimental effect of ALA supplementation on high density lipoprotein-cholesterol (HDL-cholesterol) levels (SMD 0.57; 95% CI, −0.14, 1.29; P = 0.11).

      Conclusions

      Overall, the current meta-analysis demonstrated that ALA administration may lead to an improvement in glucose homeostasis parameters and lipid profiles except HDL-cholesterol levels.

      Keywords

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