Active ingredients

Who checks them

In Australia, sunscreen is treated like a medicine, not a cosmetic. That's stricter than most of the world. To be sold here, a primary sunscreen has to:

• be listed on the Australian Register of Therapeutic Goods, which is where its AUST L number comes from;
• use only ingredients from the TGA's approved list; and
• pass the Australian/New Zealand sunscreen standard, AS/NZS 2604.

Moisturisers and make-up with a small SPF claim are a lighter category, and don't go through all of that. Lip balm products are also excluded, even when they make a high SPF claim.

Australians famously use a lot of sunscreen, so the TGA built its own exposure model around how much we actually slap on, more often and over more skin than most countries. Its reviews then look for a safety margin of 100 times or more. That's a deliberately cautious line, not a sign that anything is harmful at normal use.

The TGA's message, updated September 2026, hasn't changed: the benefits of sunscreen far outweigh any risks.

Different countries allow different lists. Australia and the EU allow a big, modern toolkit of filters. The US list barely changed for decades, which is why American sunscreens can seem a bit behind. In June 2026 the FDA added bemotrizinol, its first new sunscreen filter in more than 20 years.

How filters work

Mineral filters are zinc oxide and titanium dioxide. Organic filters (the ones usually called “chemical”) are everything else. Both kinds soak up UV before it reaches your skin, and turn it into a tiny amount of heat.

Some filters work best in pairs. Avobenzone is brilliant at blocking UVA but fades in sunlight on its own, so it's usually teamed with a steadier partner like octocrylene. The newer, bigger molecules (the Tinosorbs, DHHB, ethylhexyl triazone, the Mexoryls) hold up fine by themselves.

No single ingredient decides how good a sunscreen is. SPF and UVA protection come from the whole recipe: the mix of filters, how they're dissolved, how evenly they spread, and how much you use.

What “absorbed into the blood” actually means

You may have seen headlines saying sunscreen ingredients end up in your blood. Here's where that came from. In 2019 and 2020 the US FDA ran deliberately extreme tests: a thick layer of sunscreen over three-quarters of the body, up to four times a day, for several days. All six older filters it tested showed up in blood above a very low trigger level, and some lingered for a while.

That trigger isn't a danger line. It's the point where the FDA asks for more data. Your body absorbs all sorts of things from your skin and food every day. What matters is whether the amount gets anywhere near a level that has caused problems in lab studies.

The TGA ran those numbers for Australian use. In 2025 it reviewed seven common filters: five had plenty of room to spare and need no change. For two, homosalate and oxybenzone, the most extreme scenario (the maximum amount allowed, all over the body, every day for years) didn't quite clear its extra-cautious 100-times margin, though face-and-hands use at lower amounts did. In 2026 it reached the same kind of finding for 4-MBC. So it's proposing lower limits. The TGA calls this “a precautionary measure” based on high-dose animal studies, “not human studies”. That's a regulator being careful, not a regulator finding harm.

You might also read about hormone effects. Some studies link certain older filters with hormone measures, but they mostly observe people who were exposed to lots of things at once, so they can't show that sunscreen caused anything. The TGA's 2025 review put it plainly: the evidence isn't enough to show cause in people.

Octinoxate is a good example of the difference between “can do something in a lab” and “does something to you”. Europe's scientific committee agreed it can affect hormones in experiments, and still judged it safe at 10%, including for children, because real-world amounts are so far below that.

Do sunscreen ingredients cause cancer?

No. There's no convincing evidence that any approved sunscreen ingredient causes cancer when you use it on your skin. Cancer Council puts it simply: chemicals in TGA-approved sunscreens sold in Australia “are safe to use without increasing your risk of cancer”.

The worry usually comes from three things getting mixed up:

1. Titanium dioxide has questions about breathing in fine powder. That's about dust and sprays, not a cream on your skin, which Europe's scientific committee still considers safe.
2. Benzophenone sounds like oxybenzone but is a different chemical. It can form in tiny amounts from octocrylene during manufacture or if a bottle is stored badly, so regulators keep it to trace levels. That's quality control, not a verdict on octocrylene.
3. “Absorbed” isn't the same as “harmful”, as above.

The thing that does reliably cause skin cancer is UV. Which is rather the point of sunscreen.

Reefs and the environment

Hawaii, Palau, parts of the Caribbean and Thailand restrict oxybenzone and octinoxate, based on lab studies of stressed coral. Australia hasn't brought in reef bans; the TGA's reviews are about people.

In Europe, octocrylene is being looked at for how long it hangs around in water. That's an environmental question, and a separate process from the one that decides whether it's safe on your skin.

If you're snorkelling the reef and want to be extra kind to it, a mineral or Tinosorb-based sunscreen without oxybenzone or octinoxate is the usual “reef-friendlier” pick. That's a nice choice to make, not a rule.

Using it well

The ingredients matter much less than using enough, often enough. Cancer Council and the TGA agree on the basics:

1. Go by the UV Index, not the temperature. At 3 or above, it's sunscreen time, even on a cool day.
2. Pick SPF50 or 50+, broad-spectrum and water-resistant, with an AUST L number and a date that hasn't passed.
3. Put it on 20 minutes before you head out.
4. Use more than you think: about 7 teaspoons (35 mL) for an adult's whole body. That's one each for your face, neck and ears, each arm, each leg, your front and your back.
5. Top up every 2 hours, and after swimming, sweating or towelling off.
6. Sunscreen works best with a hat, a shirt, shade and sunnies.
7. Cancer Council advises against aerosol sprays. On a breezy beach, a lot of the spray blows away before it reaches you.
8. The best sunscreen is the one you'll actually wear. The TGA says mineral versus chemical is personal preference, not a safety ranking.
9. If one stings, try a fragrance-free one, or switch to different filters.
10. Keep the bottle below 30°C, and out of a hot car. Heat wears down the SPF.

A note on SPF numbers: some products have had their SPF claims questioned in testing. That's about whether a particular product lives up to its label, not about any ingredient being unsafe. An AUST L number means a sunscreen is registered, but it doesn't guarantee every batch.

Babies. Cancer Council doesn't recommend sunscreen for babies under six months, because their skin is extra sensitive. Shade, clothing and hats do the job instead.

Vitamin D. When the UV is 3 or above, most people get enough from a few minutes of everyday incidental sun, like walking to the shops. Sun protection doesn't put you at risk of running low.

Choosing one

Any approved sunscreen you'll wear is a good sunscreen. If you'd like to go with where the regulators are heading:

1. The easy, no-fuss pick: zinc oxide, titanium dioxide, or both. The TGA is fine with nano particles.
2. The modern all-rounders: bemotrizinol, often teamed with bisoctrizole, DHHB, ethylhexyl triazone, zinc or a Mexoryl.
3. Perfectly fine, no need to swap: avobenzone, octocrylene, octinoxate, octisalate, ensulizole.
4. Getting lower limits: homosalate and oxybenzone. Finish the bottle you have; there's no need to go looking for them.
5. Worth skipping in new purchases: 4-MBC, which Europe banned from May 2026 and the TGA is now reviewing, and the old PABA-family filters and 3-benzylidene camphor, which are rare these days.

Too little sun protection is a much better-known risk than any approved filter. That's still the TGA's view, and ours.

What's changing

Worth keeping an eye on over the next year:

• The TGA's interim decision on homosalate, oxybenzone and benzophenone, due by the end of 2026.
• What the TGA decides on 4-MBC. Its consultation closes on 12 October 2026, with options ranging from one lower limit, to limits by age and product type, to a ban. An interim decision is expected in 2027.
• The outcome of the TGA's 2026 consultation on improving how sunscreens are regulated in Australia.
• Europe's next steps on octocrylene and the environment.
• A tighter European limit on an impurity (DnHexP) in the raw material for DHHB, for newly marketed products.
• Whether more modern filters (bisoctrizole, DHHB, the Mexoryls) follow bemotrizinol onto the US list.

Sources

These are the places to check once new decisions land.

• TGA: sunscreen ingredients
• TGA: safety review of seven active sunscreen ingredients (July 2025)
• TGA: safety review of 4-MBC (September 2026), and the Poisons Standard consultation that closes 12 October 2026
• TGA: understanding the regulation of therapeutic sunscreens (August 2025)
• TGA: how to choose a sunscreen
• Cancer Council: are chemical sunscreens safe to use?
• Cancer Council: sunscreen advice
• FDA: questions and answers on OTC sunscreen actions, and the final orders adding bemotrizinol (June 2026) and removing PABA and trolamine salicylate (September 2026)
• Commission Regulation (EU) 2024/996: the 4-MBC prohibition
• EU scientific committee (SCCS) opinions: octinoxate, SCCS/1671/24 (June 2025); DHHB and DnHexP, SCCS/1678/25; titanium dioxide, SCCS/1661/23 (May 2024); 4-MBC, SCCS/1639/21; BP-4 and BP-5; HAA299; PBDT
• ECHA: octocrylene REACH restriction process (2026)
• TGA: consultation on homosalate, oxybenzone and benzophenone (July 2025), and the 4-MBC consultation (closes 12 October 2026)
• FSANZ: review of titanium dioxide as a food additive (2022)
• Cole, Shyr and Ou-Yang, Photodermatology, Photoimmunology & Photomedicine, 2016: “Metal oxide sunscreens protect skin by absorption, not by reflection or scattering”
• Matta et al., JAMA, 2020: the FDA's maximal-use absorption trial
• Cancer Council: sun protection and babies, and vitamin D
• Current Environmental Health Reports, 2025: “Endocrine and Reproductive Health Considerations of Sunscreen UV Filters” (a review of 75 studies, 2014 to 2024)
• Marcon et al., Photochemistry and Photobiology, 30 March 2026: “Advances in organic UV filters for sunscreens over the past decade”