Many conventional sunscreens contain chemical UV filters that are safe for humans but harmful once they enter the sea. Ingredients such as oxybenzone, octinoxate, octocrylene and homosalate are known to affect corals and a wide range of marine organisms. Even very small amounts washed off in the water can have measurable consequences, especially in calm bays or shallow coastal areas.
Corals are extremely sensitive to chemical substances. Certain UV filters can disrupt the cellular functions that corals rely on, making them more vulnerable to stress. They may lose their natural colour, stop growing or struggle to reproduce. Young coral larvae are especially at risk because they absorb these substances quickly and often cannot survive long term exposure.
These findings have led regions such as Hawaii, parts of the Caribbean and the Maldives to ban specific sunscreen ingredients. The goal is to reduce coral bleaching and protect reef structures that are already under pressure from warming seas.
Chemical UV filters also affect a wide range of marine animals. Fish, turtles, sea urchins and shellfish may experience hormonal disruptions when exposed to these substances. Young animals and larvae are particularly sensitive because their developing systems react more strongly to chemical changes in their environment.
In addition, many chemical filters accumulate inside the tissue of marine organisms. This means they remain in the food chain and increase in concentration as they move from smaller species to larger ones.
Chemical filters work by absorbing UV rays through a chemical reaction on the skin. Mineral filters such as zinc oxide and titanium dioxide, on the other hand, reflect UV rays physically. Mineral sunscreens are generally considered less harmful for marine life, but only when they are not based on nanoparticles. Nano sized particles can affect plankton and other small organisms, which form the foundation of marine ecosystems.
Awareness is the most important factor. Sunscreen protects our skin, but certain formulas can harm the sea. By choosing alternatives carefully and reducing what enters the water, visitors help protect seagrass meadows, coral reefs and countless marine species that depend on healthy ecosystems.
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