Ultraviolet filter

Ultraviolet (UV) filters are a diverse class of chemical compounds primarily used in topical sunscreens and personal care products to shield the skin from the deleterious effects of solar ultraviolet radiation [1]. These agents are broadly categorized into organic filters, such as benzophenones and cinnamates, which absorb UV photons and release that energy as heat, and inorganic filters like zinc oxide and titanium dioxide, which physically reflect and scatter UV rays [2]. By attenuating the penetration of UVA and UVB radiation into the dermis and epidermis, UV filters play a critical role in preventing DNA damage, chronic photoaging, and the development of skin malignancies, including melanoma and basal cell carcinoma [3]. Despite their therapeutic benefit in cancer prevention, the term 'UV filters' refers to a class of active chemical ingredients rather than a specific biological target or receptor [1]. Certain organic filters, most notably oxybenzone (benzophenone-3), have come under scientific and regulatory scrutiny due to their high rates of systemic absorption and potential to act as endocrine disruptors by interacting with human hormone receptors [4]. Additionally, environmental impact studies have demonstrated that specific UV filters contribute to coral reef degradation and toxicity in aquatic ecosystems, leading to bans in certain geographical regions [5].

Other names

Sunscreen agentsUV absorbersPhotoprotective agentsUV screensSolar filters

Ultraviolet filters function through two primary physicochemical mechanisms: organic filters contain conjugated aromatic systems that absorb high-energy UV radiation and dissipate it as lower-energy heat, while inorganic filters consist of mineral particles that reflect and scatter UV radiation to prevent it from reaching the viable layers of the skin.