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Background Hyperglycemia is the hallmark of diabetes, and the associated oxidative stress is a major concern that invites an array of diabetic complications. The traditional practices of medicare are of great, current interest due to the high cost and side effects of conventional diabetic medications. The present  in vitro  study focuses on evaluating the potential of various  A. occidentale  root extracts for their antihyperglycemic and antioxidant potentials. Materials and methods The four different solvent extracts petroleum ether (PEAO), chloroform (CHAO), ethyl acetate (EAAO), and 80 % methanol (80 % MAO) of  A. occidentale  roots were evaluated for their total phenolic, flavonoid, and antioxidant capacity. Using MIN6 pancreatic β-cells, the cytotoxicity of the extracts was evaluated by MTT assay and the antidiabetic potential by quantifying the insulin levels by ELISA at a higher concentration of glucose. The effect of 80 % MAO on  INS  gene expression was determined by qRT PCR analysis. Results Among the four different solvent extracts of  A. occidentale  roots, 80 % MAO showed the highest concentration of phenolics (437.33 ± 0.03 µg GAE/mg), CHAO to be a rich source of flavonoids (46.04 ± 0.1 µg QE/mg) and with the highest total antioxidant capacity (1865.33 ± 0.09 µg AAE/ mg). Evaluation of the free radical scavenging and reducing properties of the extracts indicated 80 % MAO to exhibit the highest activity. The MTT assay revealed the least cytotoxicity of all four extracts. 80 % MAO enhanced  INS  up-regulation as well as insulin secretion even under high glucose concentration (27mM). Conclusions The present study demonstrated that the  A. occidentale  root extracts have effective antihyperglycemic and antioxidative properties, together with the potential of normalizing the insulin secretory system of β-cells. Above mentioned properties have to be studied further by identifying the active principles of  A. occidentale  root extracts and  in vivo  effects. The prospect of the present study is identifying drug leads for better management of diabetes from the  A. occidentale  root extracts. Graphical abstract

Root extracts of Anacardium occidentale reduce hyperglycemia and oxidative stress in vitro