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Toxic Sunscreens: Impact on Coral Reefs & Other Sea Life

Bottom Line

  1. Protect yourself from the sun by wearing SPF-rated clothing to decrease the need for sunscreen use.

  2. Protect coral reefs and other sea life by avoiding sunscreen products with the active ingredient oxybenzone (benzophenone-3) and a host of other potentially harmful chemicals.

  3. Educate fellow divers and students on the impact of sunscreens on the underwater environment.

  4. Be a role model and use only sunscreens that are free from harmful ingredients identified by independent researchers.

  5. Sunscreens marked “reef safe” may not be! Read the contents label. Use sunscreens that contain non-nano titanium dioxide and/or zinc oxide.


As open water divers, we find ourselves in the sun a lot, and the regular application of sunscreen has become part of our dive day regimen. But sophisticated sunscreen consumers we were not. Our sunscreen buying “research” started and ended when we found a sale at our favorite big-box retailer.


Over the years, sloshing mask water and sweaty brows contaminated our eyeballs with sunscreen lotion applied to our face. The results were anything from stinging eyes to dilated pupils and outright episodes of temporary blindness.  Our search for tear-free sun protection made us realize that some of our favorite sunscreen brands actually harm the very coral we dive to enjoy.


We clearly had missed the news: Research has shown that Oxybenzone (Benzophenone3) and other common sunscreen ingredients adversely impact the growth of coral, and there is a growing effort to ban sunscreens containing these harmful ingredients.

Community Action

MEXICO. Along Mexico’s Riviera Maya, aquatic eco-nature parks like Xcaret and Xel-Há confiscate sunscreens from inbound visitors containing ingredients like:

  • Octocrylene

  • Benzophenone

  • Butyl methoxydibenzoylmethane

  • Hexyldecanol

  • cetyl dimethicone

  • methylparaben

  • polyethylene

  • Propylparaben, and

  • Butylcarbamate

The park replaces harmful chemical sunscreens with a “biodegradable sunscreen” considered more ecologically friendly.

U.S. VIRGIN ISLANDS. Sunscreens containing oxybenzone, octinoxate and octocrylene are now banned, according to the Los Angeles Times.

BONAIRE. Look for this diving mecca to ban sunscreens containing oxybenzone and octinoxate on January 1, 2021. The Bonaire Island Council approved this measure during a 2018 meeting, according to InfoBonaire.

HAWAII. In 2021, Hawaii will prohibit sunscreens containing oxybenzone and octinoxate. Back in May 2018, the state legislature sent Senate Bill 2571 to the governor for signature.

KEY WEST. In Florida, the Key West City Commission voted to ban sunscreens containing oxybenzone and octinoxate. Read the New York Times story.

THAILAND. The country of Thailand has banned sunscreens containing xybenzone, octinoxate, 4-methylbenzylidene camphor or butylparaben. Read the Bankok Post story.

PALAU. In 2020, the country of Palau will be the first nation to ban sunscreens deemed caustic to reefs. Palau is considered one of the world's top diving destinations. Read the New York Times article here

AMERICAN NATIONAL PARKS. The National Park Service, U.S. Department of the Interior, published a flyer called Protect Yourself, Protect Your Reef! that outlines the harmful effects of certain chemical sunscreen active ingredients on coral reefs.


If you are a diver, dive instructor, or just an adventurous, above-water sun worshiper, become an informed sunscreen consumer. SPREAD THE WORD! You have the chance to educate friends, family, fellow divers and dive operators about this important topic. Start reading sunscreen labels. If the active ingredients have unpronounceable, chemical-sounding names, there is a good chance you could be adversely impacting coral reefs.

Look for sunscreens that use active ingredients like non-nano titanium dioxide and/or zinc oxide. We have had good luck with no-tear face protection during dives using the following brands:


We will not rewrite the empirical research conducted on this topic; rather, we will point you to solid links on the harm chemical sunscreens can do to our oceans. Please take our warning: SOME SUNSCREENS THAT CLAIM TO REEF SAFE ARE NOT! Some sunscreen manufacturers have gone so far as to fund junk science studies in an effort to debunk scientific research.

Downs C.A., Kramarsky-Winter E., Segal R., et al. (2016.) Toxicopathological Effects of the Sunscreen UV Filter,Oxybenzone (Benzophenone3), on Coral Planulae and Cultured Primary Cells and Its Environmental Contamination in Hawaii and the U.S. Virgin Islands. Arch Environ Contam Toxicol 70(2), 265-288. doi:10.1007/s00244-015-0227-7 [See]  


Environmental Working Group. (2017.) The Trouble with Sunscreen Chemicals. Retrieved June 3, 2018. [See]


ChemSec SIN List. (2018.) International Chemical Secretariat’s SIN (Substitute It Now) listing for Oxybenzone. Retrieved June 3, 2018. [See]

Danovaro, R., Bongiorni, L., Corinaldesi, C., Giovannelli, D., Damiani, E., Astolfi, P., … Pusceddu, A. (2008). Sunscreens Cause Coral Bleaching by Promoting Viral Infections. Environmental Health Perspectives, 116(4), 441–447. doi:10.1289/ehp.10966 [See]


Haereticus Environmental Laboratory. (20 Oct. 2015). New Scientific Study Finds Coral Reefs Under Attack from Chemical in Sunscreen Lotions. (Press release). [See]


Zafar, H., Ali, A., Ali, J. S., Haq, I. U., & Zia, M. (2016). Effect of ZnO Nanoparticles on Brassica nigra Seedlings and Stem Explants: Growth Dynamics and Antioxidative Response. Frontiers in Plant Science, 7, 535. doi:10.3389/fpls.2016.00535 [See]


Zamoiski RD, Cahoon EK, Freedman M, Linet MS. 2015. Self-reported sunscreen use and urinary benzophenone-3 concentrations in the United States: NHANES 2003-2006 and 2009-2012. Environmental Research. 142(Oct): 563-567. [See]


The best reef-safe sunscreens of 2023, according to experts

Why you should wear reef-safe sunscreen, even if you're not snorkeling

Ban Toxic Sunscreens

National Ocean Service Skincare Chemicals and Coral Reefs

Updated 09 October 2023

A Harmful Mix. Time Magazine Inforgraphic.

"A Harmful Mix."

Time Magazine Infographic on Oxybenzone. 

NOAA: Sunscreen Chemicals and Marine Life
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