As summer approaches, sun protection becomes top of mind. But not all sunscreens are created equal. Most commercial sunscreens contain chemical filters such as oxybenzone, octinoxate, or homosalate. These are known endocrine disruptors, meaning they can interfere with hormone balance in the body.
That’s why zinc oxide and titanium dioxide are the standout choices. They work differently: instead of absorbing UV rays and altering them, these minerals act as physical blockers, sitting on top of the skin to deflect harmful UVA and UVB radiation. Importantly, in their natural state, their particles are too large to penetrate the skin.
The Problem With Nanoparticles
To solve the common complaint of “white-cast” sunscreen, many companies now use nanoparticles of zinc oxide and titanium dioxide. This makes the sunscreen spread clear on the skin instead of leaving a white layer.
The concern? When these minerals are ground down into nano size, the particles become small enough to penetrate the skin barrier. This means they no longer act purely on the skin’s surface, they may enter the body.
What We Don’t Yet Know
While research is ongoing, there is currently no clear data on the long-term effects of nanoparticles in sunscreen. Some studies suggest nanoparticles may generate free radicals when exposed to sunlight, potentially contributing to oxidative stress in the body. Others question whether inhalation of nanoparticles (such as from sprays or powders) poses risks to the lungs.
Until science catches up, one thing is certain: the safety of nano zinc and titanium has not been fully established.
Better Safe Than Sorry
If protecting your skin from the sun also means protecting your overall health, the best choice is to stick with non-nano zinc oxide or titanium dioxide sunscreens. While they may leave a slight white cast, that visible layer is a reminder that the minerals are staying on your skin, right where they belong, and effectively blocking UV rays.
🗝️ Key Takeaway
When choosing sunscreen, look for “non-nano zinc oxide” or “non-nano titanium dioxide” on the label. These natural minerals are still the safest, most effective options we have without the hormone-disrupting risks of chemical filters and without the unknowns of nano technology.
Recommended Sans Product
After sun exposure, apply this rich, plant-based butter to soothe, rehydrate, and nourish your skin. It helps restore moisture, cascades in antioxidants, and supports skin recovery.
