Comparative effectiveness of six herbs in the management of glycemic status of type 2 diabetes mellitus patients: A systematic review and network meta-analysis of randomized controlled trials

There are several herbal formulations for type 2 diabetes (T2D), but many of them have never been directly compared to establish the most effective methods. Therefore, the present systematic review and network meta-analysis aimed to compare and rank the effects of herbal formulations by combining direct and indirect evidence on the management of type 2 diabetes. From five electronic databases, relevant studies on the effectiveness of herbal formulations for glycemic status for people with type 2 diabetes were retrieved. Only randomized controlled trials that were published in English and looked at how herbal formulations affected adults' (>18-year-old) glycemic levels were included. A systematic review and network meta-analysis design with the random-effects model was used. A total of 44 trials included 3130 participants on six herbs were included in the final analysis. Apple cider vinegar (ACV) (standardized mean difference (SMD) = −28.99), cinnamon (−9.73), curcumin (−13.15), and fenugreek (−19.64) significantly reduced fasting blood glucose (FBG) compared with placebo (all p < 0.05). Notably, only ACV (SMD = −2.10) and fenugreek seeds (0.84) were found significantly effective in reducing HbA1C. ACV was most effective herb to reduce FBG comparison with other herbs. Several herbs could be considered as a valuable adjuvant therapy regarding glycemic control of type 2 diabetes patients. Health professionals should be encouraged to incorporate these herbs for the management of type 2 diabetes as part of their standard care.