Efficacy, Persistence And Safety of Inorganic vs. Organic Sunscreens: A Narrative Review

As concerns arise regarding skin cancer and photoaging in individuals, understanding the effectiveness of inorganic and organic sunscreen formulations is an essential matter for both healthcare providers and consumers. This literature review analyzes relevant peer-reviewed studies published between the years 2005 and 2024, focusing on matters of efficacy such as overall clinical performance, photostability, user safety, and persistence. Inorganic sunscreens, primarily composed of zinc oxide and titanium dioxide, function by reflecting and scattering UV rays; organic sunscreens, primarily composed of oxybenzone, avobenzone, and octinoxate, absorb UV radiation instead. Findings suggest that, while having different mechanisms, both inorganic and organic sunscreens provide efficient UV protection. Inorganic sunscreens are found to possibly be more safe, persistent and effective for individuals with sensitive skin barriers and prolonged water exposure; organic sunscreens are found to possibly be more effective for individuals expecting minimal water exposure. However, direct comparison between the two sunscreen agents is limited in factors of consumer application and regulated human testing conditions. Despite technological advancements and concern regarding sunscreen efficacy, a gap is still present; a need is highlighted for an increase in controlled standardized clinical trials to assess specific sunscreen efficacy more accurately.