Emerging Advancements in Microneedle Technology in Health Care

In this study, we comprehensively review the emerging advancements in microneedle (MN) technology as a novel and minimally invasive platform for transdermal drug delivery and cosmetic applications. Microneedles are micron-sized needle structures, typically ranging from 10 to 2000 µm in height, designed to transiently disrupt the stratum corneum without reaching dermal nerve endings, thereby enabling painless delivery of therapeutic and cosmetic agents. This article systematically discusses the various types of microneedles, including solid, dissolving, hollow, coated, hydrogel, and swellable microneedles, with emphasis on their mechanisms of action, material composition, and suitability for delivering hydrophilic drugs, macromolecules, vaccines, and biologics. Manufacturing technologies such as micro-molding, laser cutting, micro-electromechanical systems (MEMS), and stereolithographic 3D printing are reviewed, along with the physicochemical and mechanical evaluation parameters essential for ensuring device safety, efficacy, and stability. Key applications in cosmetic therapy, enhanced drug delivery, diagnostic sampling, biosensing, and collagen induction therapy are highlighted. Although microneedle-based systems offer significant advantages over conventional needle-based delivery—including improved patient compliance, reduced pain, and lower risk of infection—challenges related to regulatory standardization and potential skin damage persist. The study also outlines future prospects, emphasizing the potential role of artificial intelligence and machine learning in optimizing microneedle design and performance, thereby supporting their broader clinical and commercial translation.