This thesis investigates the stability of cosmetic products when exposed to UV radiation. The formulation of cosmetic products requires knowledge of factors that can affect their stability and behavior. UV (ultraviolet) radiation is one of the factors that must be considered because it causes photodegradation of ingredients in cosmetic products, resulting in changes in color, scent, texture, efficacy, and safety. Stability, safety, and quality of products are imperatives in the chemical industry; therefore, it is necessary to investigate different types of UV radiation and their effects on various groups of cosmetic products. SPF (Sun Protection Factor) is a measure of protection provided by a product against UV radiation that can cause burns or the development of skin cancer, and today the awareness of the harmful effects of sun radiation is well known, making such products increasingly prevalent in various forms and formulations. Products with an SPF factor contain a combination of ingredients such as UV filters and antioxidants that enhance photostability, thereby reducing the risk of irritation or allergic reactions that can result from the photodegradation of ingredients. Techniques such as HPLC (High-Performance Liquid Chromatography) and UV/VIS spectrophotometry are used to evaluate the photostability of cosmetic products due to UV exposure. Additionally, an important factor for stability, besides formulation, is the selection of packaging and storage of the products. Various strategies are continuously considered to improve the stability of cosmetic products exposed to UV radiation while adhering to regulatory requirements and standards.