Diabetes mellitus is a long-term metabolic disease characterized by high blood glucose levels resulting from insufficient insulin production, reduced insulin secretion, or a combination of multiple reasons. The number of people exploring additional and complementary therapies, such as herbal supplements, has increased dramatically due to the rising prevalence of diabetes worldwide, especially Type 1 (which needs insulin) and Type 2 (which results in insulin resistance). A comprehensive investigation of the therapeutic potential of several common plants is conducted for the purpose of treating diabetes mellitus. It emphasizes the active bioactive chemicals, mechanisms of action, and clinical efficacy of these drug candidates. Herbal remedies for diabetes mellitus include Momordica charantia (bitter melon), Trigonella foenum-graecum (fenugreek), Gymnema sylvestre (gurmar), and Ocimum sanctum (holy basil). These herbs have the ability to regulate blood glucose levels through a variety of ways, including increasing insulin secretion, boosting insulin sensitivity, and limiting carbohydrate absorption. The review also discusses the herbal remedies' safety, efficacy, and limits, highlighting the need for additional clinical trials to establish their therapeutic potential in diabetes management.