Nanotechnology, particularly nanoemulsions (NEs), is an essential topic that has piqued the interest of researchers over the years. These significant molecules feature a spherical solid structure, a lipophilic amorphous negative charge surface, with small droplet size, and a large surface area, all of which contribute to the promising future of nanomedicine and the importance of NEs in a variety of sectors. The advantages and disadvantages of the components, preparation, characterization, assessment, and applications as a delivery medication system are summarized in this review paper. There are two different methods for NEs preparation: the high and low energy methods. In high energy methods, high-pressure homogenization, ultrasonication micro fluidization, and Spontaneous emulsification are described thoroughly. Low energy approaches emphasize phase inversion temperature, solvent evaporation technology, and hydrogel technologies. Low-energy procedures should be preferred over high-energy methods since they utilize less energy and do not necessitate the use of specific instruments. The transdermal application, aerosolized, ingestible NEs, and parenteral techniques are the four primary lines of biomedical uses of NEs as a delivery strategy. To summarize, these novel strategies are very promising, but additional research is needed to fully understand the relationship between NE formulation and physiological and pathological problems associated with diverse preparation, characterization, and administration routes. .
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