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Lipid-based Nanoparticles (LNPs) have emerged as promising carriers for enhancing the efficacy, safety, and patient adherence of antidiabetic therapies. These systems, including Solid Lipid Nanoparticles (SLNs), Nanostructured Lipid Carriers (NLCs), liposomes, and nanoemulsions, exhibit unique physicochemical and pharmacokinetic advantages. Their biocompatibility, ability to protect labile drugs from degradation, and capacity to improve oral bioavailability make them especially valuable for delivering poorly soluble antidiabetic agents. This review comprehensively evaluates various lipid-based platforms, comparing their structural characteristics, drug loading efficiencies, release profiles, and targeting capabilities. SLNs offer excellent stability and controlled release, while NLCs improve drug loading and flexibility. Liposomes provide versatile encapsulation of both hydrophilic and lipophilic drugs, and nanoemulsions are ideal for enhancing rapid absorption. Collectively, these systems outperform conventional formulations by enhancing therapeutic outcomes and reducing systemic side effects. Current challenges, such as large-scale manufacturing and regulatory complexity, are discussed alongside future directions to inform translational research. Lipid-based nanoparticles represent a transformative strategy in the evolution of antidiabetic drug delivery.