A Guide to Reef-Safe Sunscreen: What It Is, Why It Matters & How to Choose the Best
Protecting your skin in the sun is essential, but many conventional sunscreens do more harm than good when they wash off in the ocean. Reef-safe sunscreen isn’t just a trend, it’s a small choice with a big impact on marine life and coral reef ecosystems.
In this guide we'll address:
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Why reef-safe sunscreen matters
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What ingredients to avoid
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What to look for on labels
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Recommended reef-safe sunscreen brands
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Tips for using sunscreen responsibly
Why Reef-Safe Sunscreen Matters
Coral reefs are some of our planet’s most vibrant and biodiverse ecosystems. They support thousands of marine species and protect coastlines from erosion and storm damage. But coral reefs are facing unprecedented stress from climate change, pollution and human activity.
One major, preventable threat is the chemical pollution from traditional sunscreens.
When sunscreen washes off your body in the ocean, certain ingredients can:
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Bleach coral, weakening or killing it
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Interfere with coral reproduction
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Accumulate in water and sediment, affecting fish and invertebrates
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Disrupt marine ecosystems at a foundational level
This isn’t theoretical, scientific studies have shown that even tiny amounts of these chemicals can harm coral larvae and other sensitive species.
Choosing reef-safe sunscreen is one of the easiest ways you can protect ocean environments while still caring for your skin.
What Ingredients to Avoid
Not all sunscreens are created equal. Many popular formulations contain chemicals that are harmful to coral and other marine life.
Here are some key ingredients you should avoid when looking for a reef-safe formula:
❌ Oxybenzone / Benzophenone-3
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Common UV filter
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Linked to coral bleaching and DNA damage
❌ Octinoxate (Octyl Methoxycinnamate)
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A known hormone disruptor
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Found in many everyday sunscreens
❌ Other chemicals of concern
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Homosalate
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Octocrylene
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PABA
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Nano-particles of certain minerals (without proper formulation)
These chemicals are often referred to on lists of reef-harmful UV filters.
What to Look for on Labels
Choosing a truly reef-safe sunscreen means paying attention to what’s inside the bottle.
Here’s what to look for:
✅ Mineral UV Filters
These are generally non-toxic to marine life and effective on skin.
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Zinc Oxide (non-nano)
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Titanium Dioxide (non-nano)
Non-nano means the particles are large enough not to penetrate skin or harm marine organisms.
✅ Reef-Safe / Coral-Safe Labels
Look for packaging that clearly says:
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Reef-safe
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Coral-safe
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Ocean-friendly
Be aware that not all “reef-safe” labels are regulated — ingredient lists are the most reliable indicator.
✅ Broad-Spectrum Protection
This means protection from both:
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UVA (aging)
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UVB (burning)
✅ SPF 30+
Higher SPF offers more protection in strong sun.
How to Use Sunscreen Responsibly
Even the best reef-safe formula matters less if applied incorrectly..
Here are tips to get the most out of your product:
Apply 15-20 Minutes Before Sun Exposure
This allows the sunscreen to bind to skin.
Reapply Every 2 Hours
Especially after swimming or sweating.
Apply on Land
Try to apply sunscreen before entering the water so less goes into the ocean directly.
Choose Gentle Formulas
If you’re sensitive, choose reef-safe products that are also hypoallergenic and fragrance-free.
Brands That Prioritise Reef-Safe Sunscreen
Here are some recommended reef-safe sunscreen brands that are widely praised for both performance and ocean-friendly formulas:
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Sun Bum Original SPF 50 – Mineral & reef-safe option
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All Good Sport SPF 30 – Non-nano zinc formula
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Raw Elements SPF 30+ – Eco-certified mineral sunscreen
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Blue Lizard Sensitive SPF 30+ – Dermatologist-approved
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Thinksport SPF 50+ – Non-nano zinc oxide
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Thank you Farmer SPF 50+PA++++
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Supergoop! Glowscreen SPF30
Note: Always read ingredient lists to confirm reef-safe status, as formulations can change.
The Zigi Swim Commitment
At Zigi Swim, we believe protecting oceans and coral reefs is central to responsible swim culture. That’s why we:
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Feature reef-safe sunscreen partners at our events
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Educate customers on ocean-friendly choices
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Support coral adoption and conservation efforts
Your sun protection shouldn’t come at the cost of our reefs - you can have both healthy skin and a healthy ocean!
Final Takeaway
Switching to reef-safe sunscreen is one of the simplest, most impactful choices you can make as a conscious swimmer. It keeps you protected while significantly reducing your environmental footprint. Your body and the planet will thank you!