Do Sargassum Seaweed on Beaches Pose a Health Risk to Children?

Brown algae known as sargassum, increasingly present on coastlines due to ocean warming and changing currents, naturally accumulate arsenic, a toxic element even in small doses. A recent study examined the health risks for children playing on beaches affected by these strandings. Researchers analyzed how children might be exposed to arsenic in sargassum, whether through contact with water, sand, or the algae themselves.

The findings show that immediate health risks, such as non-cancerous illnesses, remain very low. However, prolonged exposure, particularly through skin contact, could slightly increase the long-term risk of cancer. Children who tend to put objects in their mouths—a behavior known as pica—are especially at risk. The analysis also reveals that up to 59% of the arsenic in fresh sargassum can be released into the environment, meaning it is accessible and could come into contact with children.

Researchers emphasize the importance of better understanding how children interact with sargassum and how arsenic behaves once the algae are stranded. They recommend improving beach hygiene, raising public awareness, and considering the removal of sargassum to reduce exposure. These measures would help protect the most vulnerable populations, such as young children, whose developing bodies are more sensitive to toxic substances.

The study highlights the need for regular monitoring of beach quality and adapting management practices to mitigate risks associated with these algae. While sargassum is natural, its increasing accumulation and ability to concentrate pollutants like arsenic make it a public health concern. A comprehensive approach, combining research, prevention, and action, is essential to ensure the safety of beachgoers.

Credits and Attributions

Primary Source

DOI: https://doi.org/10.1007/s12403-026-00762-3

Title: Does Sargassum on Beaches Pose Health Risks to Children Through Arsenic Exposure During Recreational Play?

Journal: Exposure and Health

Publisher: Springer Science and Business Media LLC

Authors: Brittany Mc Intyre; Melanie Cerna; Afeefa A. Abdool-Ghany; Guangliang Liu; Yong Cai; Alesia Ferguson; Jiayu Li; Helena Solo-Gabriele