As such, this review aims at reviewing the current developments in the use of nanoemulsion (NE) particularly in the following fields such as cosmetics and pharmaceuticals. Nanoemulsions, especially those with droplet sizes below 200 nm, are environment-friendly to improve solubility and bioavailability and are efficient in the delivery of the active ingredient. The study on pharmaceutical applications revealed that NE had promising features in overcoming difficulties closely connected with the use of conventional dosage forms, especially in Central Nervous System (CNS) diseases and different cancer forms. The skills demonstrating the ability to increase the stability and bioavailability of drugs and to reduce the toxicity of side effects are highlighted, illustrating such possibilities as chemotherapy and transdermal drug delivery. In cosmetic applications, NE enables the high penetration of the active components and enhances product stability while affording UV protection making them ideal in skin care products. This review is focused on methods for the preparation of nanoemulsions to high-energy and low-energy ones and their potential for improving therapeutic effects and cosmetic performance.
