Timeline of bans

In the past eight years the map for two molecules has shrunk steadily.

Hawaii, 2018

Hawaii SB 2571 – first state-level US ban. From 1 January 2021, sunscreens with oxybenzone and octinoxate cannot be sold OTC. Based on reef damage evidence from Downs et al., 2016.

Key West, 2019

Municipal ban protecting the only living coral reef in continental US waters.

Palau, 2020

Strictest ban on the planet. From 1 January 2020, Palau bans 10 organic UV filters, including oxybenzone, octinoxate, octocrylene, 4-MBC, triclosan, parabens. Import fine up to $1000.

Aruba, Bonaire, USVI, Mexican biosphere reserves

2020–2024: dozens of dive-tourism jurisdictions added similar restrictions.

Why oxybenzone

Systemic absorption

Matta et al., 2019 (JAMA 321:2082). Volunteers applied sunscreen to 75% of body surface 4x/day for 4 days. Plasma samples:

Peak oxybenzone plasma concentration hit 188 ng/mL, 377x above the FDA 0.5 ng/mL threshold that triggers mandatory systemic toxicity studies.

In 2019 FDA proposed moving oxybenzone out of GRASE into "insufficient data to support GRASE" – US regulator no longer assumes it's safe.

Endocrine activity

  • Rodent in vivo shows weak estrogenic activity (Schlumpf et al., 2001).
  • Metabolites detected in urine of 97% of US children (CDC NHANES 2003–2006).
  • Epidemiological links to testosterone levels and endometriosis debated, causality not established.

Photocontact allergy

Regularly in the top 10 contact allergens among sunscreens in derm patch-test databases.

Reef damage

Downs et al., 2016 – toxicity to coral larvae at 62 ppt (parts per trillion). Heavy-tourism Hawaii zones measured up to 19,000 ppt.

oxybenzone page.

Why octocrylene

Degradation to benzophenone

Downs et al., 2021 (Chemical Research in Toxicology 34:1046). Researchers analyzed supermarket sunscreens for benzophenone content at different shelf ages.

Mechanism: retro-Michael reaction. Octocrylene on long storage (especially in a hot car) breaks down releasing benzophenone.

  • Fresh: trace or below detection.
  • After 12 months: up to 199 ppm in some samples.
  • After 18 months: up to 435 ppm.

Benzophenone is classified by IARC as group 2B (possible human carcinogen). EU bans it in food plastic packaging.

Shelf-life problem

Sunscreens typically have 30–36 months shelf life. Half of that is warehouse and retail. By the time a consumer opens the bottle, octocrylene has already partially degraded – and there's no way to check freshness at the counter.

What to use instead

European and Asian alternatives:

  • DHHB – UVA1 coverage, replaces avobenzone without photo-instability.
  • Tinosorb S – broad UVA+UVB, self-stabilizing.
  • Tinosorb M – organo-mineral hybrid.
  • Mexoryl XL – UVA+UVB, silicone structure.
  • Uvinul T 150 – strong UVB.

Mineral (globally allowed):

  • Zinc Oxide 15–25% – broad spectrum, physical stability.
  • Titanium Dioxide – mostly UVB, often paired with ZnO.

What to do with leftovers

  • Fresh (under 6 months): finish it.
  • Over a year old: toss it, especially if stored in fluctuating temperatures.
  • Buying abroad: read the INCI before paying. Many US mass-market sunscreens still contain oxybenzone. In Europe it's rarer.

Bottom line

Oxybenzone and octocrylene are 1990s filters. Modern alternatives beat them on every parameter: broader spectrum, photo-stable, lower systemic absorption, no degradation to an IARC 2B carcinogen. The only reasons these molecules stay on the market are inertia and cost. In 2026, picking a sunscreen without them takes five seconds.