Abstract
The production of sunscreens is regulated by laws and lists, constantly updated on the basis of scientific information. Most advanced countries have regulatory bodies that publish and update the list of authorized substances. Inorganic filters, zinc oxide and titanium dioxide are often used as nanostructured forms. Nanoparticles have been the subject of technological studies aimed at improving efficacy and safety. The organic ingredients are able to absorb UV radiation on a selective or broad spectrum. The latter is preferable given the role of UVA radiation in skin carcinogenesis. The organic filters may interact with epidermal proteins and induce sensitization. They can also be absorbed, causing systemic effects. In addition, some organic ingredients, such as avobenzone, may undergo photodegradation, needing special formulation requirements.
Financial & competing interests disclosure
The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties.
No writing assistance was utilized in the production of this manuscript.