Oxybenzone in Sunscreen: A Comprehensive Ecotoxicological Review

Oxybenzone (benzophenone-3) is a widely used organic compound in sunscreens and other personal care products due to its ability to absorb ultraviolet (UV) radiation. It is effective in protecting the skin from harmful UV rays, thereby reducing the risk of skin cancer and photoaging. However, increasing concerns have emerged regarding the environmental impact of oxybenzone, particularly in marine ecosystems.

A comprehensive literature search was conducted using databases such as PubMed, Scopus, and Web of Science. Keywords included "oxybenzone," "sunscreen," "ecotoxicology," "marine organisms," and "environmental impact." Studies published from 2000 to 2023 were included to ensure a thorough understanding of the topic.

Oxybenzone has been detected in various marine environments, with concentrations ranging from nanograms to micrograms per litre. Oxybenzone has been shown to cause bleaching in corals, impairing their ability to recover from stress. Research indicates that oxybenzone exposure can lead to endocrine disruption in fish, affecting reproductive success and behaviour. Oxybenzone has been found to be toxic to various invertebrates, including mollusks and crustaceans. Sub-lethal effects include impaired growth and development, as well as altered feeding behaviour. The data indicate a clear concentration-response relationship for oxybenzone toxicity across different species. Lower concentrations tend to produce sub-lethal effects, while higher concentrations can lead to mortality.

The findings of this review highlight the significant ecotoxicological risks posed by oxybenzone in marine environments. The widespread use of oxybenzone in sunscreens, combined with its persistence in aquatic ecosystems, raises concerns about its long-term effects on marine biodiversity. A balanced approach that considers both human health and environmental sustainability is essential for the future of sunscreen formulations.