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To know me is to know that I love the sun, which means that I am somewhat of an expert when it comes to . I've tested what feels like under the sun and have my clear favorites; however, as I was planning a trip to Hawaii, where there are very about what types of SPF can be sold, I had to start testing anew. The ingredients in most are a major cause of coral bleaching in Hawaii (and many other ocean ecologies around the world), so you can't just put any old drugstore SPF on if you're planning on getting in the water.

This is a complex and nuanced issue, but here's the quick TL;DR for what can SPF. First, it's important to note that there are no government regulations for using the word "reef-safe" or "reef-friendly" on packaging, so you'll need to look at the ingredients to determine if something is actually safe. Many of the sunscreens that call themselves "reef-safe" still contain ingredients that harm coral reefs, like avobenzone, octisalatate, and octocrylene.



The only ingredients that are truly reef-safe are zinc oxide and — and even then, the particle size matters when it comes to marine life. Several studies (published in various journals like the , , and ) have shown that nano-sized particles of zinc oxide in particular can poison marine life. The TL;DR: If you're going to get in the ocean, you need to look for sunscreens that specifically say "non-nano zinc" and list it as the only active ingredient.

The thing is, pretty much all zinc-based SPFs while effective, wel.

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