Sun Bum’s original sunscreen line is not reef safe. It contains chemical UV filters, including octocrylene, that research has linked to harm in coral and marine organisms. Sun Bum does, however, sell separate mineral sunscreen lines that use zinc oxide and titanium dioxide instead, which are a better choice for ocean environments.
The answer depends entirely on which Sun Bum product you pick up, because the brand’s lineup spans both chemical and mineral formulas with very different environmental profiles.
What’s in Sun Bum’s Original Formula
Sun Bum’s original (and most popular) sunscreens rely on chemical UV filters to absorb ultraviolet light. These filters include avobenzone, homosalate, octisalate, and octocrylene. While they’re effective at preventing sunburn, several of these ingredients raise concerns for marine ecosystems.
NOAA lists octocrylene as one of the sunscreen chemicals that can harm marine life, alongside better-known offenders like oxybenzone and octinoxate. Lab studies on Symbiodinium, the tiny algae that live inside coral and keep it alive, show that octocrylene at elevated concentrations damages cell membranes and reduces metabolic activity. It also triggers oxidative stress in those cells at lower, sub-lethal levels. Without healthy Symbiodinium, corals bleach and eventually die.
The original Sun Bum line does not contain oxybenzone or octinoxate, so it technically complies with Hawaii’s ban on those two specific chemicals. But legal compliance and reef safety are not the same thing. Hawaii’s law targets only two ingredients out of a longer list of chemicals known to affect aquatic life.
Sun Bum’s Mineral Lines Are the Safer Choice
Sun Bum sells a mineral sunscreen line and a Baby Bum mineral line that skip chemical filters entirely. The mineral SPF 50 lotion uses 20% zinc oxide as its only active ingredient. The Baby Bum Mineral Roll-On SPF 50 combines 15.7% zinc oxide with 3.4% titanium dioxide. Neither product contains octocrylene, oxybenzone, octinoxate, or any other chemical UV filter.
A 2022 National Academy of Sciences review concluded that mineral sunscreens are a better option for aquatic environments because they cause fewer effects on marine organisms compared to chemical formulas. NOAA echoes this, noting that mineral sunscreen “does not use chemical UV filters” and is the preferred choice for protecting coral reefs. There is one caveat: nano-sized particles of zinc oxide and titanium dioxide can still pose some risk, so non-nano mineral formulas are the gold standard if you want to minimize impact entirely.
No Third-Party Reef Safety Certification
Sun Bum does not carry the Protect Land + Sea certification from the Haereticus Environmental Laboratory, which is the most rigorous independent standard for reef-safe sunscreen. That certification screens for a broad list of chemicals beyond just oxybenzone and octinoxate, and Sun Bum’s products (including the mineral lines) do not appear on HEL’s certified product list. This doesn’t necessarily mean the mineral formulas are harmful, but it does mean they haven’t been independently verified against the strictest environmental criteria available.
How to Tell Which Sun Bum Product You’re Buying
Sun Bum’s packaging can make this confusing. The original line and the mineral line share similar bright, retro-style branding. To check what you’re getting, flip the bottle and look at the “Active Ingredients” panel, which is required on all sunscreens sold in the U.S.
- Reef-friendlier: Active ingredients list only zinc oxide, titanium dioxide, or both. These are Sun Bum’s mineral and Baby Bum mineral products.
- Not reef safe: Active ingredients include any combination of avobenzone, homosalate, octisalate, or octocrylene. This is the original Sun Bum line.
If you’re shopping online, look for the word “Mineral” in the product name. Sun Bum’s original formulas don’t include that word.
Hawaii’s Ban vs. Actual Reef Safety
Hawaii’s Act 104 banned the sale of sunscreens containing oxybenzone and octinoxate, and Maui County has gone further by requiring mineral-only sunscreens in certain contexts. Since Sun Bum’s original line avoids those two banned chemicals, it can still be sold in Hawaii. But NOAA identifies at least ten sunscreen chemicals that can harm corals and marine life, and octocrylene, which is in Sun Bum’s original formula, is on that list.
If you’re planning a trip to Hawaii, the US Virgin Islands, Palau, or any marine-protected area, choosing a mineral sunscreen is the more responsible move regardless of what local law technically requires. The legal standard is a floor, not a ceiling, when it comes to protecting reefs.
Practical Tips for Reef-Conscious Sun Protection
Switching to mineral sunscreen is one step, but it’s not the only way to reduce your impact on marine environments. Rash guards and UV-protective clothing eliminate the need for sunscreen on covered skin entirely. If you do apply mineral sunscreen, putting it on 15 to 20 minutes before entering the water lets it bind to your skin and reduces how much washes off.
Keep in mind that sunscreen chemicals enter the ocean not just from swimmers but also through wastewater. Showering off chemical sunscreen sends those compounds into water treatment systems that don’t fully remove them. So your sunscreen choice matters even if you’re not swimming at the beach that day.