Non-Nano Zinc Oxide Sunscreen

Why We Choose Non-Nano Zinc Oxide in Our Sunscreen

When we set out to create a sunscreen at Scence, we knew it had to do more than just protect skin from the sun. It needed to feel good to use, be kind to sensitive skin, and sit comfortably with our values around health and the environment. One of the most important decisions we made was to use non-nano zinc oxide as our active ingredient, and I’d love to explain why, with a little more of the science behind it.

A Gentle, Effective Way to Protect Skin

Zinc oxide is a mineral UV filter that provides broad-spectrum protection against both UVA (ageing rays) and UVB (burning rays). Scientifically, it works by reflecting, scattering, and importantly, absorbing UV radiation across a wide wavelength range (approximately 280–400 nm).

What makes zinc oxide so special is its photostability. Unlike some chemical filters that can degrade when exposed to sunlight, zinc oxide remains stable and continues to protect the skin without breaking down. This means consistent protection over time.

It is also known for its anti-inflammatory properties, which is why it has been used for decades in calming skin formulations. For sensitive or reactive skin, that is incredibly valuable.

What Do We Mean by “Non-Nano”?

The term “non-nano” refers to particle size. In regulatory terms, nanoparticles are defined as particles smaller than 100 nanometres.

At Scence, we use zinc oxide particles that are larger than this threshold. This matters because particle size influences how an ingredient behaves on the skin.

Larger, non-nano particles are far less likely to penetrate beyond the outermost layer of the skin, the stratum corneum. Scientific studies have shown that zinc oxide, even in nano form, does not significantly penetrate healthy skin, but choosing non-nano adds an extra level of reassurance and aligns with a precautionary approach.

Staying on the Surface, Where It Belongs

From a biological perspective, the skin barrier is very effective at keeping particles out, particularly insoluble minerals like zinc oxide. Non-nano zinc sits on the surface, forming a protective film that interacts with UV radiation before it reaches living skin cells.

This is important because UV damage occurs when radiation penetrates into deeper layers of the skin, leading to DNA damage, oxidative stress, and premature ageing. By stopping that radiation at the surface, zinc oxide helps prevent these processes before they begin.

A More Mindful Environmental Choice

We are always thinking about what happens after a product leaves our skin. Zinc oxide is an inorganic mineral, and while it does enter the environment, its behaviour is very different from some organic (chemical) UV filters.

Certain chemical filters have been shown to bioaccumulate and disrupt marine organisms at low concentrations. Zinc oxide, by contrast, is less likely to bioaccumulate in the same way. However, particle size still matters.

Nanoparticles have a much higher surface area to volume ratio, which can increase their reactivity in aquatic environments. Some studies suggest that nano-sized zinc oxide can generate reactive oxygen species under UV light, potentially affecting microorganisms.

By choosing non-nano zinc oxide, we are opting for a form that is less reactive and more likely to settle rather than remain suspended in the water column. It is not a perfect solution, but it is a more considered one.

Balancing Performance and Feel

There is always a balance between performance and aesthetics. Zinc oxide’s ability to scatter visible light is what gives it that characteristic white cast, particularly with larger particles.

We work carefully with the formulation to disperse the zinc evenly and combine it with nourishing oils and butters. This improves spreadability and helps create a more natural finish, while still maintaining effective UV protection.

It is a small trade-off for an ingredient that is stable, gentle, and reliable.

Keeping Formulations Simple and Transparent

At Scence, we are guided by simplicity and clarity. Zinc oxide is a single, well-understood active ingredient with decades of safety data behind it.

We prefer this over more complex blends of multiple chemical filters, particularly when there are still ongoing questions about long-term environmental impact.

Final Thoughts

For us, choosing non-nano zinc oxide is about combining science with common sense. It is a broad-spectrum, photostable, and skin-friendly UV filter that works in harmony with the skin’s natural barrier.

By selecting the non-nano form, we add an extra layer of reassurance around skin interaction and environmental behaviour. It reflects our belief that effective sun protection does not need to be complicated, just carefully considered.

It is one of those quiet, confident choices that sits at the heart of everything we do at Scence.

Thanks for listening!

Krista