What Does Reef Safe Mean?

In general, “reef safe” refers to sunscreens that avoid ingredients shown to harm coral reefs and other marine life when washed off in the ocean.

Coral reefs are living ecosystems that support countless species and protect shorelines, so choosing the right sunscreen can make a meaningful difference.

Reef safe sunscreen uses mineral filters like zinc oxide or titanium dioxide that sit on the surface of the skin, forming a physical barrier that reflects and scatters UV rays. By checking ingredient lists carefully, you can enjoy the sun while keeping corals safe.

Laboratory studies have explored how certain sunscreen chemicals may affect marine organisms under specific conditions, particularly at higher concentrations than typically found in open water. A 2022 study by the National Academy of Sciences looked at how these chemicals affect different species. Here’s what they found:

Marine Life	What Can Happen
Green Algae	Growth slows down and photosynthesis can be affected.
Coral	Chemicals can build up in tissues, causing bleaching, DNA damage, and deformities in young corals.
Mussels	Young mussels may develop defects.
Sea Urchins	Immune and reproductive systems can be affected, and young may grow abnormally.
Fish	Fertility can drop and reproduction may be disrupted.
Dolphins	Some studies suggest certain sunscreen chemicals can accumulate in marine mammals, though real-world environmental impacts are still being researched.

These two ingredients are most commonly identified as problematic for reefs:

Ingredient	Impact on Coral & Marine Life
Oxybenzone	Linked to coral bleaching, DNA damage in coral larvae, and reduced survival at early life stages.
Octinoxate	Associated with chemical buildup in coral tissues and weakening their structure.

Both oxybenzone and octinoxate are banned from sale and distribution in marine-protected regions like Hawaii, (except by prescription) due to concerns about coral reef health. Learn more about what sunscreen you can take to Hawaii in our recent blog post.

Other Sunscreen Ingredients Often Recommended to Avoid

While not banned in the same way, these ingredients have been studied for potential environmental impact and are sometimes avoided as a precaution:

• Octocrylene: Can build up in marine life and may affect how they grow and reproduce.
• Homosalate: Can cause stress to certain species.
• Parabens: These preservatives stick around in the ocean and might affect hormones.
• Triclosan: Can harm algae and small creatures that other animals rely on for food.
• Nanoparticles: Tiny zinc or titanium particles can be eaten by some marine animals.

Reef safe sunscreen is defined by the ingredients it uses and what happens when those ingredients come into contact with the ocean.

The aim is to protect your skin without releasing chemicals that can harm coral reefs or marine life. Reef safe sunscreen generally follows these four key factors:

1. Mineral-based formulation: Uses zinc oxide or titanium dioxide as the active ingredient, forming a physical barrier that reflects and scatters UV rays. Unlike chemical sunscreens, these minerals sit on the skin rather than being absorbed.
2. Non-nano particles: Non-nano zinc oxide or titanium dioxide means the particles are slightly larger and are considered less likely to be absorbed by coral or other marine organisms.
3. Free from Hawaii-banned chemicals: Reef safe products avoid both oxybenzone, and octinoxate.
4. Formulated to minimise long-term environmental persistence.

PoolBar London’s broad spectrum mineral SPF range is formulated with non-nano zinc oxide, making it both reef safe and Hawaii-compliant. Learn more about zinc oxide, how it protects your skin and why we prefer it over titanium dioxide.

You may also see products labeled reef friendly. While it sounds similar, this term is not regulated and may refer to packaging, marketing, or sustainability efforts rather than ingredients.

True reef safe sunscreen focuses on avoiding chemicals that harm coral and using mineral-based, non-nano formulations. Always read the ingredients list carefully to confirm reef protection.

Here’s a practical checklist for choosing a reef safe sunscreen:

• Check the active ingredients: Look for zinc oxide, titanium dioxide, or a combination of both, which provides broad spectrum protection.
• Read the inactive ingredients: Avoid oxybenzone, octinoxate, octocrylene, and homosalate.
• Go non-nano: PoolBar London’s mineral formulas use non-nano particles meaning they’re larger in size and less likely to be absorbed by coral or other marine life.
• Be cautious with vague claims: Terms like “reef friendly” or “eco” may not guarantee reef safety.
• Consider trusted brands: PoolBar London is reef-safe, water resistant up to 80 minutes, and formulated for everyday use, giving you confidence that your sunscreen protects your skin and the reefs.

Choosing reef-safe sunscreen is an easy way to make a difference for marine life while keeping your skin protected every day. PoolBar London’s mineral sunscreen range, provides broad-spectrum UVA and UVB protection, a non-nano zinc oxide formula, and avoids the chemicals oxybenzone and octinoxate. Discover more about the difference between mineral vs chemical sunscreen.

Make the switch today: explore PoolBar London’s reef-safe sunscreen and protect your skin and the ocean at the same time.