On that note, there are some types of nanoparticles that are used to study the penetration of nanoparticles through the skin by optical imaging, which is fluorescent in nature. Carbon nanotubes (CNTs) are the rolled graphene, hollow, cylindrical fibers and are made of graphene walls, cylindrical hollow fibers, and composed of graphene walls. Reprinted with permission from [37]. The application of metal nanoparticles (MNPs) has drawn much attention . There has been the utilization of silver nanoparticles in toothpaste and shampoos as preservatives. Nanoparticle synthetic methods: strength and limitations For example, implications of the use of metal-based nanoparticles in cosmetic products on human health have been reported. These are spherical double phospholipid membrane-bound molecules. SLNs loaded with different antioxidants like resveratrol, vitamin E (VE), and epigallocatechin Gallate (EGCG) have been observed to provide excellent skin protection. Nanoemulsions have been used in cosmetic applications aiding delivery of active ingredients with issues in storage, solubility, stability, loss of activity, etc. Nanoparticles are classified into several main categories. Ever since then, nanoparticles are being incorporated in other personal care products, such as: deodorants, perfumes, moisturizers, anti-aging creams, toothpastes, soaps, lip balms, and lipsticks, shampoos, etc. Reprinted with permission from [37]. All data that support the findings of this study are included within the article (and any supplementary files). The key focus areas for nanotechnology agricultural research are: Nanogenetic manipulation of agricultural crops The 1st generation dendrimer has one series of branches; in the case of 2nd generation dendrimers, there are two series of branches. These CNTs-based hair colour forms a thin layer upon human hair by virtue of its small size thus imparting smooth texture as well as voluminizing them. The in vitro and in vivo toxicological studies of nanomaterials should be studied along with dermal penetration and potential inhalation, genotoxicity studies, and possible skin and eye irritation studies. For example, cerium oxide nanoparticles loaded liposomes have been used in anti-aging creams in order to minimize the adverse effects caused for the generation of free radicals thereby promoting tissue longevity [135].