Sunscreen safety update
My sunscreen contains 4-MBC—should I keep using it?
By Patrick LeachPublisher: HerDoc
Keep using sunscreen. Australia’s medicines regulator is reviewing an ingredient called 4-MBC, and its advice remains to protect your skin with sunscreen, clothing, shade, a hat and sunglasses. TGA consumer advice
But that leaves a reasonable question: if an ingredient needs another safety review, what does that mean for the bottle you already own?
The answer involves something a headline rarely explains: the amount of an ingredient, how much skin it covers and how often you use it all matter.
Sources checked: .
First, turn the bottle around
On the front of a sunscreen bottle, you’ll usually find the information you chose it for: SPF, water resistance and perhaps a promise about how it feels on your skin.
The ingredients tell another part of the story.
4-methylbenzylidene camphor, shortened to 4-MBC, is a filter that absorbs ultraviolet B radiation. It is used in some sunscreens and personal-care products. The TGA’s consultation document describes a current Australian maximum concentration of 4% in therapeutic sunscreens and cosmetic preparations. TGA safety review, consultation document
On an ingredient label, 4-MBC may also be called enzacamene, an alternative name listed in the TGA consultation document.
You won’t find it in every sunscreen. Checking the actual ingredients is more useful than making assumptions about a brand or a product’s marketing.
Why is it being reviewed?
Overseas regulatory decisions prompted the TGA to examine 4-MBC using international evidence and an Australian model of sunscreen exposure. TGA announcement
The safety questions include how much can pass through the skin and what effects exposure might have. Animal studies have raised concerns involving hormone systems, including the thyroid. Those findings need careful interpretation: they do not establish that ordinary sunscreen use causes thyroid disease or other hormone problems in people. The TGA describes its proposed restrictions as precautionary. TGA safety review, TGA explanation of the evidence
For readers, the useful question is how that evidence translates into rules for products used repeatedly over many years.
Why a face cream and a beach bottle raise different questions
Picture two routines.
One person applies a product to their face each morning. Another applies sunscreen across their arms, legs and torso, then reapplies during a day outdoors.
The ingredient concentration could be the same, while the total exposure differs substantially.
The TGA’s assessment considered different application areas and user groups. Under its highest modelled whole-body exposure at the maximum permitted concentration, 4-MBC fell below the regulator’s target safety margin. More limited application areas produced different results. That helped inform proposals involving concentration, application area and age.
A safety margin compares estimated human exposure with a study-derived safety benchmark. Falling below the regulator’s target flags a concern for assessment; it does not show that users have experienced harm. TGA review findings
This is a question for product formulation and regulation. Keep applying sunscreen in the amount directed on the label. Using less can reduce the protection you receive. Cancer Council application advice
What could actually change?
The consultation considers three approaches:
| Option | What it would involve |
|---|---|
| One concentration-based approach | New controls with a common low-concentration exemption for therapeutic sunscreens and cosmetics. |
| An approach based on use | New controls with exemptions that depend on concentration, application area, product type and age. |
| Prohibiting the ingredient | A proposal from two private applicants to prohibit 4-MBC in therapeutic goods and cosmetics. |
The first two options come from the regulator’s delegate. The prohibition proposal comes from the applicants. At the consultation stage, the TGA and delegate said they had not settled on a preferred option. TGA consultation documents
The consultation closed on 12 October 2026, ahead of committee consideration in November. The TGA’s consumer information says an interim decision on 4-MBC will be published for further consultation in 2027. A committee meeting is one step in that process; any eventual changes will need their own implementation details. Consultation timetable, TGA update
What should you do with your sunscreen now?
Yes—the TGA’s advice is to keep using sunscreen while it reviews 4-MBC. The review considers precautionary restrictions on the ingredient. Continue protecting your skin with sunscreen, clothing and shade, and discuss any concerns about your sunscreen or health with a health practitioner.
For your next bottle, focus on the details that help you use it consistently:
- Choose SPF50 or SPF50+, broad-spectrum, water-resistant sunscreen.
- Check its expiry date and follow its storage instructions.
- Apply it about 20 minutes before going outside.
- Reapply every two hours, and immediately after swimming, sweating or towel-drying.
- Combine it with protective clothing, a broad-brimmed hat, sunglasses and shade when the UV Index is 3 or above.
Cancer Council estimates that an average adult needs about seven teaspoons for a full-body application. Your sunscreen needs to be something you can comfortably apply—and reapply—in sufficient amounts. Cancer Council sunscreen guidance
Bring the bottle—and your questions—to HerDoc
Have the product name or a clear photo of its ingredients handy, along with what prompted your concern and any skin symptoms you’ve noticed. Your HerDoc GP can help assess your concerns and advise whether an in-person examination is needed.
Contact HerDoc to discuss your sunscreen and skin-health questions with a GP.