Phytochemicals in Herbal Remedies for Diabetes: Therapeutic Promise or Toxicological Risk?

Diabetes mellitus is a growing global health challenge characterized by persistent hyperglycemia and associated with significant morbidity, mortality, and economic burden. Despite advances in pharmacotherapy, many conventional antidiabetic agents are limited by adverse effects, high costs, inadequate glycemic control in some individuals, and reduced long-term compliance. These challenges have spurred growing interest in herbal remedies, especially in resource-limited settings, due to their accessibility, affordability, and perceived safety. Herbal preparations are rich in bioactive phytochemicals including flavonoids, alkaloids, terpenoids, saponins, and phenolic compounds that have demonstrated promising antidiabetic effects through various mechanisms such as enhancing insulin secretion, improving insulin sensitivity, modulating glucose metabolism, and attenuating oxidative stress. Several preclinical and clinical studies have reported improvements in glycemic indices following administration of phytochemical-rich plant extracts. However, critical concerns remain regarding their toxicological profiles, including hepatotoxicity, nephrotoxicity, and genotoxicity at high doses or with prolonged use. Additionally, the lack of standardization, variability in phytochemical content, and potential for herb-drug interactions limit their widespread adoption. This review critically examines the therapeutic potential and toxicological risks of phytochemicals used in herbal medicine for diabetes management. It underscores the need for rigorous scientific evaluation and regulatory oversight to ensure that efficacy is not achieved at the expense of patient safety. Keywords: Diabetes mellitus, herbal medicine, phytochemicals, antidiabetic activity, oxidative stress.