Walk into any pharmacy in Australia and the sunscreen aisle can feel overwhelming. Mineral or chemical? Zinc or filter? SPF 30 or 50+? And what does any of it actually mean for your kids' skin on a hot summer morning when you're already running late?

The chemical vs mineral debate is one of the most common sunscreen questions parents ask, and it comes with a lot of noise online. Some of it is useful. Some of it is marketing dressed up as science. This guide cuts through to what the evidence actually says, what Australian regulators recommend, and how to make a practical, informed choice for your family.

The short version: both types work. The longer version is worth understanding.

First, a note on the word "chemical"

The term "chemical sunscreen" trips people up because it sounds like one type is chemical and the other is not. Scientifically, that is not accurate. Everything is a chemical, including the zinc oxide and titanium dioxide in mineral sunscreens. The Therapeutic Goods Administration (TGA) uses the terms "chemical" and "mineral" to distinguish between two categories based on how their active ingredients work, not on whether they contain chemicals.^[1]

Understanding this distinction removes a lot of the marketing confusion around "chemical-free" sunscreens, which is not a meaningful claim from a scientific standpoint. What matters is which active ingredients a sunscreen contains, how they work, and whether the product meets Australian regulatory standards.

How chemical sunscreens work

Chemical sunscreens contain organic (carbon-based) compounds that absorb UV radiation when it reaches the skin. The active ingredients capture the UV energy, convert it into heat, and release that heat from the skin's surface. This process happens at the level of the sunscreen film on the skin rather than deep within skin tissue.

Common chemical filter ingredients used in Australian sunscreens include oxybenzone, homosalate, octinoxate, octocrylene, and avobenzone. Most chemical sunscreens contain a combination of several filters rather than just one, because different filters absorb UV at different wavelengths. A well-formulated chemical sunscreen will include filters covering both UVA and UVB ranges to provide broad-spectrum protection.^[2]

Practical characteristics of chemical sunscreens

• Tend to be lightweight when applied, leaving minimal to no white residue^[2]
• Often easier to blend onto skin, including on the face
• Generally more available across the range of SPF 50+ products in Australia
• Some formulas can sting if they get into eyes, which is worth noting for children^[9]
• Some people experience skin sensitivity or reactions to specific chemical filter ingredients, particularly oxybenzone^[9]

How mineral sunscreens work

Mineral sunscreens use zinc oxide, titanium dioxide, or a combination of both as their active ingredients. These mineral particles sit on the skin's surface and work by absorbing most UV radiation, with some reflection and scattering as well.^[2] Unlike chemical filters, zinc oxide and titanium dioxide are not absorbed through the skin, which is part of why they are often recommended for babies and children.

Zinc oxide in particular provides broad-spectrum protection against both UVA and UVB rays on its own, making it one of the most comprehensive single sunscreen filters available. Titanium dioxide provides strong UVB protection but is less effective against the full range of UVA rays, which is why many mineral sunscreens combine both ingredients.

Practical characteristics of mineral sunscreens

• Can leave a white or slightly grey cast on the skin, particularly on darker skin tones, though nano-particle formulations have reduced this significantly^[1]
• Generally well tolerated by sensitive skin types, including children^[10]
• Less likely to cause stinging around the eyes, as zinc oxide is considered non-irritating and unlikely to cause eye sting^[2]
• Thicker in consistency and can feel heavier on the skin
• Some formulas can feel drying, particularly on dry skin types
• Generally considered more environmentally friendly, with less concern about impact on coral reefs compared to some chemical filters

What about the TGA review of oxybenzone and homosalate?

If you have been following sunscreen news in Australia, you may have seen coverage of the TGA's review of certain chemical filter ingredients, specifically oxybenzone and homosalate. This is worth understanding clearly because it has generated a lot of concern online that does not always reflect what the TGA has actually said.

In 2025, the TGA conducted a safety review of seven chemical sunscreen ingredients and found that oxybenzone and homosalate, at their current maximum permitted concentrations in full-body applications, had a margin of safety below the preferred threshold for long-term daily use.^[3] As a result, the TGA has proposed concentration restrictions that would require some products containing these ingredients to be reformulated.

Critically, the TGA has been explicit on several key points.^[4]

• All sunscreens currently available in Australia are safe to use
• No products have been recalled or banned
• The TGA is not recommending any change in sunscreen use
• The proposed restrictions are precautionary, based on worst-case modelling of long-term daily full-body use over many years
• The expert clinical advice is that the benefits of sunscreen continue to far outweigh any potential risks from these ingredients

Cancer Council Australia has maintained its consistent position that all TGA-approved sunscreens sold in Australia are safe, and that the risk of skin cancer from not using sunscreen significantly outweighs any risk from the sunscreen ingredients currently under review.^[5]

The practical takeaway for families is this: continue using sunscreen. If you are concerned about specific ingredients, zinc oxide-based mineral sunscreens do not contain oxybenzone or homosalate and are a straightforward alternative.

Are nanoparticles in mineral sunscreens safe?

Mineral sunscreens sometimes contain nanoparticles of zinc oxide or titanium dioxide. Nanoparticles are used because they reduce the white cast that larger mineral particles leave on the skin, making the product significantly more wearable.

The TGA has reviewed the safety of nanoparticles in sunscreens and concluded that the evidence shows they do not penetrate the skin in amounts that would cause harm. When applied to healthy, unbroken skin, nanoparticle zinc oxide and titanium dioxide remain on the surface.^[1] The TGA considers nanoparticle sunscreens safe when used as directed.

What about the environment?

Some chemical sunscreen ingredients, particularly oxybenzone and octinoxate, have been associated with harm to coral reefs in laboratory studies, and several international jurisdictions have restricted their use in marine environments. The evidence is still evolving, and the real-world impact at the concentrations present from human sunscreen use is debated among scientists.

Mineral sunscreens containing zinc oxide and titanium dioxide are generally considered more environmentally benign. If environmental impact is a factor in your decision, particularly if you are snorkelling or swimming on coral reefs, a mineral formula is a reasonable choice.

Which is better for children?

For babies over 6 months and young children, mineral sunscreens containing zinc oxide are widely recommended by dermatologists and are the standard choice in many families. The reasons are practical rather than alarmist.

• Zinc oxide and titanium dioxide do not penetrate the skin, which provides confidence when applying to a child's more delicate skin barrier^[1]
• Mineral formulas are less likely to cause stinging around the eyes. Zinc oxide is recognised as non-irritating and unlikely to cause eye sting, unlike some chemical filter ingredients^[2][9]
• Mineral sunscreens are less likely to contain fragrances and preservatives that can trigger sensitivity reactions in children with reactive skin^[9]
• For children with eczema or skin conditions, a fragrance-free, preservative-free mineral formula is generally the better starting point, as chemical filters such as oxybenzone and avobenzone can irritate already-compromised skin barriers^[9]

This does not mean chemical sunscreens are unsafe for children. Many Australian families use chemical sunscreens on their children without any issues, and Cancer Council does not differentiate between the two types in its recommendations for children.^[6] The recommendation remains SPF 50+, broad-spectrum, and water-resistant, regardless of type.

If your child has had a reaction to one sunscreen, check whether the reaction was to the active filter ingredients or to a fragrance, preservative, or other formulation ingredient. Many reactions attributed to "chemical sunscreen" are actually reactions to fragrance, which can appear in mineral formulas too.^[9] A patch test on the inner forearm before full application is always worth doing when trying a new product.^[7]

Which is better for sensitive skin?

Mineral sunscreens are generally the recommended starting point for people with sensitive, reactive, or eczema-prone skin. Zinc oxide in particular has anti-inflammatory properties and is well tolerated across a wide range of skin types. It is less likely than some chemical filters to trigger a contact sensitivity reaction.^[10]

That said, sensitivity reactions to sunscreen are often driven by non-active ingredients such as fragrance, alcohol, and preservatives rather than the UV filters themselves. Cancer Council Australia confirms that reactions to sunscreen can be caused by any component of the product, including fragrance and preservatives, and are not limited to the active filter ingredients.^[9] A fragrance-free, alcohol-free mineral formula is usually the safest place to start for sensitive skin, but the specific formulation matters as much as the filter type.

Cancer Council Australia recommends doing a patch test on a small area of skin before using a new sunscreen, particularly for people with known sensitivities. If a reaction develops, consult a pharmacist or dermatologist for guidance on an appropriate alternative.^[7]

Chemical vs mineral sunscreen: a quick comparison

Here is a practical at-a-glance comparison of the two types across the factors that matter most for Australian families.

How to choose the right sunscreen for your family

Rather than getting caught up in the chemical vs mineral debate, the more useful question is: which sunscreen will your family actually use correctly, every day? That question should drive your decision more than any other factor.

Here is a practical guide to choosing based on your family's specific circumstances. Every family's skin is different, and the guidance below is intended as a general starting point and is not medical advice. If you have specific questions, skin concerns, sensitivities, or conditions, consulting your GP or a dermatologist will give you advice tailored to your individual needs.

For babies over 6 months and toddlers

Start with a fragrance-free, preservative-free mineral sunscreen containing zinc oxide. Look for a formula specifically developed for children if available. Avoid spray formats near the face due to inhalation risk. For babies under 6 months, prioritise shade and protective clothing. If sunscreen is needed for an infant under 6 months, consult a healthcare professional first.^[8]

For primary school-aged children

Either type works well. If your child has been using a mineral formula without issues, there is no need to change. If you are looking for something lighter and easier to apply quickly on a busy morning, a chemical formula is a reasonable option. Fragrance-free is always preferable for children. The most important thing at this age is building the daily habit. Consistency and reapplication matters.

For people with sensitive or reactive skin

Start with a fragrance-free, alcohol-free mineral formula containing zinc oxide.^[10] If you have had a reaction to a sunscreen in the past, check the ingredient list carefully to identify whether the reaction was to an active ingredient or a formulation ingredient such as fragrance or a preservative.^[9] A dermatologist can help with patch testing if reactions are frequent or severe.^[7]

For adults wanting daily facial SPF

A lightweight chemical formula is often the most wearable option for daily face use, particularly over makeup or in humid conditions.^[2] If you are concerned about the ingredients currently under TGA review, zinc oxide-based mineral formulas provide excellent facial protection and many modern formulations are designed to sit invisibly on the skin.^[1]

For outdoor sport and active use

Look for a broad-spectrum, water-resistant formula regardless of type. Cancer Council Australia recommends SPF 50+, broad-spectrum, water-resistant sunscreen for all outdoor sport and activity, reapplied every two hours or immediately after sweating, swimming, or towelling dry.^[11] A portable format that makes reapplication easy, like a refillable brush applicator, is particularly helpful in this context.

What actually matters most

Cancer Council Australia's position is clear and consistent: the best sunscreen is the one you will actually use.^[7] A zinc oxide formula that sits in the bathroom unused because it feels too thick provides zero protection. A lightweight chemical formula that the whole family applies correctly every morning provides real, meaningful protection.

Whatever type you choose, the non-negotiables are the same. SPF 50+. Broad-spectrum. Water-resistant. Applied generously and 20 minutes before going outside. Reapplied every two hours. Used alongside a hat, protective clothing, shade, and sunglasses.

And if the application method is part of what makes sunscreen feel like a battle in your household, a refillable brush applicator like the SUNNYBOD™ brush works with any cream or lotion sunscreen you choose, chemical or mineral. Fill it with whatever formula your family trusts, and make getting it on every day as easy as possible.

Frequently asked questions

Is chemical sunscreen safe for children in Australia?

Yes. All TGA-approved sunscreens sold in Australia, including chemical formulas, are considered safe for use.^[4] Cancer Council Australia recommends SPF 50+, broad-spectrum, water-resistant sunscreen for children without specifying filter type.^[6] Mineral sunscreens are often preferred for young children due to lower irritation risk and the fact that zinc oxide does not penetrate the skin, but chemical formulas are not contraindicated for children.

Should I stop using sunscreens with oxybenzone or homosalate?

No. The TGA and Cancer Council are not recommending that Australians stop using sunscreens containing these ingredients.^[4][5] All current products remain approved and safe. The TGA is proposing concentration limits for future formulations to provide an additional margin of safety for long-term daily use.^[3] If you would prefer to avoid these ingredients in the meantime, zinc oxide-based mineral sunscreens are a straightforward alternative.

Do mineral sunscreens always leave a white cast?

Not always. Many modern mineral formulas use nano-sized zinc oxide or titanium dioxide particles, which are significantly less visible on the skin than older formulations.^[1] The white cast tends to be more noticeable on deeper skin tones. Tinted mineral formulas have also improved considerably and are a good option for face use, particularly for adults.

Can I use a mineral sunscreen in a refillable applicator brush?

Yes. The SUNNYBOD™ Refillable Sunscreen Applicator Brush works with any cream or lotion sunscreen, including mineral formulas. Even very thick zinc formulas work well, however the canister may need a gentle tap on a flat surface while filling to help the product settle to the bottom so it can be filled to capacity.

Is reef-safe sunscreen better?

"Reef-safe" is a marketing term without a standardised definition in Australia. Generally it refers to sunscreens free of oxybenzone and octinoxate, the two chemical filters most associated with coral reef harm in laboratory studies. If reef safety is a priority when swimming in coral reef environments, a mineral formula is a reasonable choice. What is most important is that you use sunscreen at all. The risk of skin cancer from going without it is a far more significant health concern than any ingredient risk from TGA-approved sunscreens.^[5]