Hey wild one. If you care about the ocean and you care about what goes on your skin, regular sunscreen is a problem. Oxybenzone, octinoxate, and a handful of other chemical UV filters have been shown to bleach coral reefs, even in tiny amounts. They also disrupt human hormones. Hawaii banned them. Mexico banned them. Palau, Aruba, Bonaire, Thailand's marine parks, and the Maldives have all introduced restrictions. That's the story on the label.
From experience comes awareness. From caring comes action.
The good news: proper biodegradable mineral sunscreen exists, and it works. I've used it surfing in Portugal, sailing across the Atlantic, freediving in the Caribbean, and on 850km of the GR11 across the Pyrenees. This post is my straight-talking guide to which reef-safe mineral sunscreen to buy, how to spot the fakes, and what to do if you want to make your own.
Quick picks: best reef-safe biodegradable sunscreens
- Best overall (HEL certified): Badger Reef Safe Sport SPF 40
- For tropical sun: Thinksport SPF 50+
- For sensitive skin and kids: Blue Lizard Sensitive SPF 50+
- For face (least white cast): Thrive Natural Care SPF 50
- For divers (plastic-free tin): Raw Elements SPF 30
- My personal favourite (EU only): Ohm Sun Safe SPF 30 (NL/BE via Bol.com, rest of EU via Ohm direct)
Prefer to make your own? Here's my 15-minute DIY mineral sunscreen recipe.
Why Biodegradable Sunscreen Matters
Coral reefs are in serious trouble. Around half of the world's shallow coral reefs are gone or in serious decline. In the Caribbean, roughly 80% of reefs are believed to be dead. Climate change, acidification, plastic, overfishing, and biodiversity loss all play a role. And then there's the sunscreen we smear on before jumping in.
An estimated 14,000 tons of sunscreen wash into the oceans every year. Even if you never swim in the sea, your sunscreen still gets into waterways through showers and toilets that drain to the ocean eventually. And oxybenzone (the most studied problem ingredient) shows up in human urine within 30 minutes of applying it. What washes off in the water also washes into you.
How Chemical Sunscreen Damages Coral
The average sunscreen on the shelf (think Aveeno, Nivea, Banana Boat, Hawaiian Tropic, Neutrogena) contains ingredients that damage coral and marine life. The worst offender is oxybenzone. It changes the DNA of coral cells so they can't reproduce. It starves younger corals. It makes coral absorb more heat, so they bleach faster. The coral turns white and dies.
Even small amounts have been shown to damage reef ecosystems. That's why some tourism destinations prohibit mainstream sunscreen outright: Hawaii, Palau, Bonaire, Aruba, Key West, parts of Mexico (including Cozumel and Tulum), Thailand's marine parks, and the Maldives have all introduced bans or restrictions.
What Chemical Sunscreen Does to Your Body
If it does that to coral, it's worth asking what it does to you. Many chemical UV filters are hormone disruptors. The biggest offenders are oxybenzone, octinoxate, homosalate, octisalate, and octocrylene. The Environmental Working Group (EWG) gives oxybenzone a hazard score of 8 out of 10. Studies have linked oxybenzone to lower testosterone in young men, hormone changes, shorter pregnancies, and the presence of sunscreen chemicals in breast milk.
Too much sun is harmful. Now it turns out the sunscreen might be harmful too. The good news: we have options.
How to Spot Reef-Safe Sunscreen (Read the Active Ingredients)
Any brand can slap “reef safe,” “organic,” “natural,” or “biodegradable” on the label. These terms are not legally regulated. The only way to know for sure is to read the active ingredient list on the back.
The 8 ingredients to avoid
- Oxybenzone (in over 3,500 sunscreens worldwide)
- Octinoxate / Octylmethoxycinnamate (often in “long lasting” formulas)
- Octocrylene
- 4-methylbenzylidene camphor (4MBC) (banned in the US, still legal in Canada and parts of Europe)
- Octisalate
- Homosalate
- Avobenzone
- Ethylhexyl methoxycinnamate
The ingredients you want
Zinc oxide and titanium dioxide are the two mineral UV filters that are considered safe for reefs and for humans. The EWG recommends zinc oxide as the best sun protecting ingredient: strong protection, few health concerns, doesn't break down in the sun.
Two more things to look for:
- Non-nano on the label. Nano-sized mineral particles are small enough to be absorbed by you and by marine life. Non-nano is the safer choice.
- Simple ingredient list. The best sunscreens I've found have 4-8 ingredients, not 40. Fewer ingredients means less to worry about.
The Best Biodegradable Sunscreens in 2026
Preparation matters. If you're heading somewhere remote, buy your sunscreen before you go. Supply in tropical beach towns and marinas tends to be mainstream chemical stuff. My recommendations below are ones I've tested and use. All are mineral (zinc oxide), all are non-nano, all are free from oxybenzone and octinoxate.
Badger Reef Safe Sport SPF 40 (my top pick)
Badger is the only widely-available sunscreen with HEL (Haereticus Environmental Lab) certification, which is the most rigorous reef-safe testing out there. Only 4 ingredients: zinc oxide, sunflower oil, vitamin E, beeswax. 98% organic. Woman-owned, family-run, B-Corp certified. Water resistant 80 minutes. If you want one bottle on hand for everything, this is it.
Check Badger Reef Safe Sport SPF 40
Thinksport SPF 50+ (for tropical sun)
Thinksport is popular with hikers, surfers, and divers. Non-nano zinc oxide, 80-minute water resistance, no PABA, no parabens. Rubs in clearer than most mineral sunscreens. A solid pick if you want SPF 50+ for tropical conditions or long days outside.
Blue Lizard Sensitive SPF 50+ (for sensitive skin and kids)
Blue Lizard is 100% mineral, fragrance-free, and built for sensitive skin. The bottle's Smart Cap turns blue in UV light, which is useful as a reapply prompt. Great for kids, babies, and anyone with reactive skin. Dermatologist-recommended for over 20 years.
Check Blue Lizard Sensitive SPF 50+
Thrive Natural Care SPF 50 (best for face)
Thrive Natural Care uses 23.5% non-nano zinc oxide but still applies sheer. Of the mineral sunscreens I've tested, this one leaves the least white cast, which makes it my pick for face and daily use. The company does regenerative farming and uses recycled plastic tubes.
Check Thrive Natural Care SPF 50
Raw Elements SPF 30 (for divers and watersports)
Raw Elements is popular with divers and marine biologists. Non-nano zinc oxide, available in a plastic-free tin (the whole reason I love it), certified reef-safe. Denser than lotion-style sunscreens, which means it stays on through swimming and sweating.
Ohm Sunscreen (my all-time favourite)
This is the one I actually use. Ohm Sun Safe SPF 30 is a small, Dutch-made mineral sunscreen that has become my go-to in the van. Non-nano zinc oxide (20%), 77% certified organic ingredients, nourished with raspberry seed oil, jojoba oil, and cocoa butter. It's loaded with good natural oils, reflects the sun beautifully, and feels caring on the skin instead of plastic-coated.
The catch: Ohm is European only. Not on Amazon. Here's where to get it:
Where to buy Ohm Sunscreen
- Netherlands and Belgium: Order on Bol.com (fast shipping, your preferred retailer)
- Rest of Europe: Order from The Ohm Collection (free shipping in EU on orders over €60)
Where to Buy Depending on Your Country
The Amazon links above use geni.us-style routing through your country's Amazon, so they work for most regions. If you're in:
- USA, UK, Germany, France, Italy, Spain, Netherlands, Australia, Japan: Amazon links will route to your country's Amazon automatically.
- Netherlands and Belgium: Ohm Sun Safe via Bol.com is my top pick.
- Rest of Europe: Ohm ships across the EU (free shipping over €60).
- Netherlands: Natural Heroes has good options.
- Anywhere local: check your local herbal shop, eco store, or pharmacy first. Small entrepreneurs often make beautiful mineral sunscreens locally. Here's why local matters.
Tip: buy your reef-safe sunscreen before you travel. Remote beach towns and island supermarkets rarely stock mineral sunscreens. I've seen friends arrive in Bali or Bonaire and end up using the chemical stuff they were trying to avoid because that's all there was.
Make Your Own Natural Sunscreen
The cleanest option is DIY. I've been making my own mineral sunscreen for years now. It's 7 ingredients, 15 minutes, approximately SPF 25 (adjustable higher), and costs a fraction of buying commercial. I use it surfing, hiking, and sailing. It works. And knowing exactly what goes on my skin feels good.
Read the full DIY sunscreen recipe here. Ingredients, step-by-step, and FAQs.
How to Protect Yourself from the Sun (Beyond Sunscreen)
Sunscreen should be the last line of defence, not the only one. Before you reach for any bottle, consider:
- Cover up. Long sleeves, a cap, sunglasses, a surf hat. Clothing is the best sun protection there is.
- Time it right. Be outside in the morning and late afternoon. Seek shade between 11am and 3pm when the UV is strongest.
- Check the UV index. Apps like Sunburnmap tell you how intense the UV is where you are.
- Eat primal. Tomatoes, seaweed, green tea, coconut oil, nuts, berries, and even wine contain compounds that protect skin from UV damage.
- Get some sun. Sun gives you vitamin D, and vitamin D helps protect your skin. Around 1 billion people worldwide are vitamin D deficient. Smothering yourself in SPF 50 all day every day isn't healthy either.
- Build up. Short gradual exposure lets your skin build its own protection. Avoid long midday sessions when you haven't seen the sun all winter.
After-Sun Care: Repair from the Inside Out
No matter how well you prepare, a life of sailing, surfing, and watersports takes a toll on your skin. I've had my share of UV damage. What helps most is from the inside out: sleep, hydration, clean food, less stress.
For topical care after a day in the sun, I keep it simple:
- Fresh aloe vera straight from the plant. Nothing beats it. I grow one in the van in summer and it's saved me many times.
- Coconut oil. Soothing, hydrating, smells like the tropics. Use cold-pressed and organic.
- Avocado or papaya mashed as a mask. Sticky, colourful, messy. But your skin drinks it up.
- Eating well. Tomatoes, berries, green tea, fatty fish, nuts. Your skin repairs from what you eat more than what you rub on.
Skip mainstream after-sun lotions. Most are loaded with fragrances and chemicals that add to the damage already done by the sun.
Frequently Asked Questions
Is “reef-safe” on the label a guarantee?
No. The term is legally unregulated. Any brand can print it. The only way to know is to check the active ingredients on the back of the bottle. If it contains oxybenzone, octinoxate, octocrylene, avobenzone, homosalate, or octisalate, it's not reef-safe regardless of what the front says. If it contains only zinc oxide and/or titanium dioxide, it's genuinely mineral.
What's the difference between biodegradable, reef-safe, and mineral sunscreen?
In practice, these terms overlap. “Mineral” refers to the active ingredients (zinc oxide, titanium dioxide) that physically reflect UV. “Reef-safe” means the sunscreen doesn't contain ingredients that damage coral. “Biodegradable” means it breaks down in the environment without leaving toxic residue. A properly-formulated mineral sunscreen is usually all three. A chemical sunscreen with zinc oxide added on top is not.
Why does mineral sunscreen leave a white cast?
Zinc oxide is white and reflects light. That's how it works. All mineral sunscreens leave some white cast. The newer formulas (like Thrive and Thinksport Clear Zinc) use smaller-particle non-nano zinc to reduce the effect, but some white cast is part of the trade-off. Rub it in well and the cast fades in a few minutes.
Is titanium dioxide safe?
In sunscreen, yes, titanium dioxide is considered safe and reef-safe as long as it's non-nano. It's less effective against UVA than zinc oxide, so many brands combine the two. The main concern with titanium dioxide is inhalation (which is why spray sunscreens are problematic), not topical application.
Is nano zinc the same as non-nano zinc?
No. Nano zinc has particles smaller than 100 nanometers, small enough to be absorbed by your skin and by marine life. Non-nano has larger particles that stay on top of the skin and don't penetrate. Always look for “non-nano” on the label. It's the safer choice for you and the reef.
Which mineral sunscreen is best for kids?
Blue Lizard Sensitive or Badger. Both are zinc oxide-based, fragrance-free, and gentle on sensitive skin. Avoid spray sunscreens for kids (inhalation concern with titanium dioxide) and stick with lotions.
Is homemade mineral sunscreen as effective as commercial?
For daily use and moderate sun, yes. The active ingredient (zinc oxide) is the same. The limitation is you can't lab-test your exact SPF, so you can't guarantee the exact number. For extreme conditions (tropical midday sun, long water exposure, babies, very fair skin), a lab-tested commercial mineral sunscreen gives you more certainty. I use DIY for most days and keep a tested commercial one for high-intensity conditions.
What about spray sunscreens?
Skip them. Most spray sunscreens contain chemical UV filters. The few mineral sprays that exist have issues too: titanium dioxide is not meant to be inhaled, the aerosol propellants are problematic, and you apply much less product than you think you're applying. Lotions and sticks are better.
Learn More
- How to Make DIY Natural Sunscreen in 15 Minutes
- The 7 dangerous ingredients of sunscreen
- Why oxybenzone and octinoxate are bad for reefs
- A single drop of sunscreen can kill coral
- EWG Sunscreen Guide
Related Reading
- DIY Natural Sunscreen Recipe
- Trail Hygiene: Staying Cleanish While Hiking and Wildcamping
- Biodegradable Shampoo for Travel
- Natural Toothbrush: The Miswak Branch
- Zero Waste Travel Kit
- Portable Water Filtration Solutions
- Best Compost Toilets for Van Life
What's your favourite reef-safe sunscreen? Have they gone plastic-free yet? Let me know in the comments.
References
- Caribbean coral reef loss (The Guardian)
- Effects of sunscreen on coral bleaching (NCBI)
- 5 sunscreen ingredients to avoid (Treehugger)
- Sunscreen poisoning ocean reefs (NYT)
- The trouble with sunscreen chemicals (EWG)
- EWG Sunscreen Guide
- Nanoparticles in sunscreen (EWG)
As always, opinions are my own. No brand is paying me to write this. Some product links are affiliate links. At no extra cost to you, orders through this website help me keep creating honest, independent content about ocean action and natural living. Here are more ways to support.
