The development of NIDDM is mostly due to insulin resistance. This disorder develops when cells in the body do not react normally to insulin, despite having normal blood glucose levels. Type 2 diabetes may be effectively treated with medications that increase insulin receptor (IR) phosphorylation. They aid in enhancing the first stages of insulin signaling. The stem bark of Cinnamomum zeylanicum Blume was used to extract a proanthocyanidin called Cinnamtannin B1, which was then utilized in a research to determine whether or not it might phosphorylate IR. This chemical is a member of the Lauraceae genus. The chemical makeup of the substance was deduced using spectroscopy. Cinnamontannin B1 (0.11 mM) increases insulin receptor-subunit phosphorylation on 3T3-L1 adipocytes. Inhibition of GLUT4 by cytochalasin B and phosphatidylinositol 3-kinase (PI3K) activity by vanadate. Insulin receptor phosphorylation was unaffected by vanadate. These findings suggest that Cinnamtannin B1 stimulates the PI3K pathway, leading to the phosphorylation of IR