As we approach summer and celebrate Earth Day this week, I thought I’d revisit the issue of sunscreen safety, both for us and the environment. While this article will primarily focus on the environment, stay tuned for upcoming articles on sunscreen safety for humans.
Anyone who asks me about sunscreens knows that I am a stickler for ingredients -zinc oxide only as much as possible. While there are 16 sunscreen ingredients FDA approved in the US, only Zinc oxide and titanium oxide are Generally Recognized as Safe and Effective (GRASE) by the FDA.
When considering reef safety, some sources call out titanium oxide as a potential threat, so THINK ZINC!
In July 2018, I wrote an article about Hawaii’s reasoning for the ban on Oxybenzone and Octinoxate: “In 2015, scientists testing coral reef and water in various tropical locations demonstrated that chemical sunscreens, Oxybenzone and Octinoxate, are damaging to coral reefs. Oxybenzone has received the most attention, causing coral bleaching and DNA damage to the coral. Corals bleach when they lose or expel the nutritional algae that normally live inside them.”
In 2021, Hawaii signed into law a bill banning the sale of sunscreen containing Oxybenzone and Octinoxate. Since then, many other states and localities have followed including Key West in Florida, Palau, the U.S. Virgin Islands, Aruba, Bonaire, and Mexico.

Over the years there have been a substantial amount of data presented regarding sunscreen safety and the impact of sunscreen on coral reefs. While some have concluded that warming of the oceans is responsible for the decline of coral reefs, sunscreens remain in question.
We, as dermatologists, want our patients to use sunscreen because 1 in 5 Americans get skin cancer. Regular sunscreen use decreases the damaging effects of the sun on the skin and reduces skin cancer development. As a dermatologist, I remove multiple skin cancers each workday. Skin cancer is a reality I would like to see changed and sun protection plays an important role!
I use sunscreen every day on my exposed areas. I would like to encourage my patients, family, and friends to do the same. If you are worried about environment’s safety, USE ZINC OXIDE!
Researchers have identified NON-NANO zinc oxide to be the safest and least damage to coral AND the FDA and dermatologists recognize zinc oxide and the safest and most effective sunscreen.
But what exactly makes a particle NANO? And how do we know what the particle size is on the sunscreens we find in the store? Most organizations agree that the cut off is 100nm. So, we want the particle size to be >100nm for coral reef safety. The only way to know for sure is to obtain information from the manufacturer, but unfortunately, there is no standardized test or governing body to ensure labeling and claims are true.
Each year, I provide a Sunscreen Update on our website around memorial day. While no sunscreen is perfect, these are ones that I use and recommend and should fall within the realm of safe to both humans and our environment.
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