Here is the thing almost nobody tells you at the till: "reef safe" is not a regulated claim. No agency defines it, no agency tests for it, and any brand may print it on any bottle. The only reliable information on the package is the ingredients panel on the back.
What Hawaii actually banned
The reason this conversation exists is a real law. Act 104, Session Laws of Hawaii 2018, signed on 3 July 2018, made Hawaii the first US state to restrict sunscreen sales over reef damage. From 1 January 2021 it became unlawful to sell, offer for sale or distribute in the state any sunscreen containing oxybenzone or octinoxate without a prescription from a licensed healthcare provider.
Both are chemical UV filters, and both have been linked in published work to coral bleaching — the stress response in which coral expels the algae it lives with, which can ultimately kill the reef and harm other marine life. A later measure — Act 117, Session Laws of Hawaii 2021 — extended the same prescription-only restriction to avobenzone and octocrylene from 1 January 2023.
Why the label on the front means nothing
Because there is no agreed testing protocol for reef impact, "reef safe" and "reef friendly" products are not regulated by the FDA. The phrases are marketing terms. A bottle can carry them while containing filters that a jurisdiction has specifically restricted, and no one is breaking a rule.
This is the whole practical lesson of the article: turn the bottle around and read the active ingredients panel. That part is regulated. The claim on the front is not.
And PABA?
PABA — para-aminobenzoic acid — is the ingredient people still ask about, and it is largely a historical answer. It was one of the earliest UVB filters and fell out of use decades ago, driven mainly by contact allergy and staining rather than by reefs. You are unlikely to find it in a modern sunscreen at all. It survives on labels as a marketing badge more than as a meaningful distinction.
Where the science is genuinely unsettled
We would rather be straight with you than sell you certainty we do not have. The laboratory evidence connecting oxybenzone and octinoxate to coral bleaching is what drove the legislation, and it is real work. How much sunscreen contributes to reef decline in the open ocean, relative to the far larger pressures of warming seas, agricultural runoff, sedimentation and overfishing, is a live scientific argument rather than a settled number.
Two things can be true at once: rising sea temperature is overwhelmingly the biggest threat to coral, and it still makes sense to avoid pouring restricted UV filters into a shallow, enclosed bay full of swimmers. Choosing a different bottle costs you nothing.
What actually reduces your impact
Ingredient choice is one lever, and not the largest one. If you snorkel or swim over reef:
- Wear a rash guard or UV shirt. Fabric protects the skin it covers completely and puts no chemistry in the water at all. This is the single most effective change on the list.
- Apply on dry land, well before you swim. Product that has bound to your skin washes off far less than product applied at the water's edge.
- Use enough, but not absurd amounts. The goal is a proper layer on exposed skin, not a slick.
- Respect local rules. Marine parks in Thailand and elsewhere have their own restrictions on what may be worn in the water. Follow the signage — it is not decorative.
- Never stand on or touch coral. Physical contact kills more coral in a busy snorkel bay than any bottle does.
How to read our bottles
We would rather teach you to check than ask you to trust a slogan — including ours. Every Hawaiian Style product carries its full ingredients panel on the bottle and on its product page. If reef-restricted filters matter to you, read that panel against the list above before you buy, exactly as you should with any brand.
And if anything there is unclear, ask us. We would rather answer a specific question about a specific ingredient than print a phrase on the front of a bottle that no regulator has ever defined.