Ionic liquids (ILs), nanofluids, and nanoparticles (NPs) represent the new frontier in biomedical and biotechnological applications because of their incredible impact on healthcare and clinical sciences. Advanced material systems demonstrate unique physicochemical properties: a high degree of thermal stability, tunable solubility, biocompatibility, and low volatility, thus offering a wide range of applications in drug delivery, bioimaging, diagnostics, and regenerative medicine. Among these, ILs have been recognized as a tunable solvent for biomolecular stabilization, enzyme catalysis, and nucleic acid preservation more effectively and efficiently than the classical organic solvents. On the other hand, nanofluids are carefully designed suspensions of metallic, polymeric, or carbon-based nanoparticles in liquid media that show superior thermal conductivity and controlled flow behavior, therefore being ideal candidates for hyperthermia treatment, biosensing, and targeted therapeutic delivery. Precision medicine and theragnostic have been transformed by nanoparticles because of their size-dependent optical, magnetic, and catalytic characteristics. With notable clinical success in cancer treatment, infectious disease management, and vaccine development, functionalized nanoparticles (NPs) such as AuNPs, AgNPs, polymeric nanocarriers, and lipid nanoparticles facilitate targeted drug administration, controlled release, and bioimaging. Promising options for tissue engineering, organ preservation, and noninvasive therapies are provided by nanofluids that contain NPs. To guarantee their safe clinical use, however, issues including toxicity, long-term biocompatibility, and regulatory permissions continue to be important research topics. Beyond ILs, biofluids and nanofluids improve medication bioavailability and therapeutic efficacy, offering significant breakthroughs in biological and clinical applications. This chapter examines regulatory issues, nanotoxicology research, and biofunctionalization methods that are essential for clinical translation. These materials are crucial for regenerative therapies, diagnostics, and next-generation treatments in nanomedicine and biopharmaceutical engineering because they bridge the gap between materials science and biomedicine.