These ingredients are still commonly used in sunscreens sold by U.S. brands. According to the U.S. National Oceanic and Atmospheric Administration, the application of sunscreen can have unintended consequences for our environment. When we swim or shower, the sunscreen we apply may wash off and find its way into our waterways.

Chemicals found in some sunscreens that can harm marine life include:

- Oxybenzone (Benzophenone-3, BP-3)
- Octinoxate (Ethylhexyl methoxycinnamate)
- 4-Methylbenzylidene Camphor (4MBC)
- Butylparaben
- Benzophenone-1
- Benzophenone-8
- OD-PABA
- 3-Benzylidene camphor
- Nano-Titanium dioxide
- Nano-Zinc oxide
- Octinoxate
- Octocrylene

These chemicals can pose various risks to marine life. For example, they can impair the growth and photosynthesis of green algae. Coral can accumulate these substances in their tissues, leading to coral bleaching, DNA damage, deformities in young coral, and even death. Mussels may experience defects in their offspring, sea urchins can suffer damage to their immune and reproductive systems, as well as deformities in their young. Fish may encounter decreased fertility, reduced reproduction, and the development of female characteristics in male fish. Dolphins can also accumulate these chemicals in their tissues, which can then be passed on to their young. Notably, Thailand has implemented a ban on sunscreens containing these harmful ingredients due to their detrimental impact on the local marine environment.

Regardless, it's extremely important to protect your skin with sunblock from harmful UV rays. So what can you do? Consider using sunscreens that are free of these harmful chemicals to marine life, seek shade between 10 am and 2 pm, and opt for Ultraviolet Protection Factor (UPF) sunwear, such as shirts or pants with UV-blocking properties. And don't forget to stay hydrated! Wishing you a safe and enjoyable summer! 

Sources: https://oceanservice.noaa.gov/news/sunscreen-corals.html
https://www.bbc.com/news/world-asia-58092472
Graphics owned by National Oceanic and Atmospheric Administration of the U.S.