 lipid nanoparticles, LNPs, such as solid lipid nanoparticles, SLNs, and nanostructured lipid carriers, NLCs, have become increasingly popular for their ability to deliver drugs or other substances to specific locations within the body. SLNs are composed of solid lipids, while NLCs are modified SLNs that can increase the stability and loading capacity of the particles. Both structures offer advantages over traditional colloidal carriers, such as emulsions, liposomes, and polymeric nanoparticles. The article discusses the features, structure, and innovations of both SLNs and NLCs, and provides a comprehensive review of their applications and drug delivery, research, cosmetics, and clinical medicine. This article was authored by Nata Nasri, Hati Valizata, and Parvind Zakiri Malani.