Why I decided to use an organic UV Filter
- Both mineral and organic UV filters primarily absorb UV radiation — neither simply "sits on top" as a physical shield
- Mineral filters are synthetically produced; "natural" is a marketing description of origin, not process
- Zinc oxide requires ~20% concentration for adequate UVA protection, creating texture problems that reduce consistent use
- NAYA Everyday Sun Cream uses three photostable organic filters: Tinosorb S, Uvinul A Plus and Uvasorb HEB — no zinc oxide, no titanium dioxide
- The most effective sunscreen is the one you actually want to wear every day
When I started developing the Everyday Sun Cream, I tested over twelve variants. I began with full mineral formulations — because that is what clean beauty expected, and frankly because I wanted to believe the narrative. What I found through that process changed how I think about UV filter science entirely.
How UV filters actually work
The most persistent misconception in sunscreen is the idea that mineral filters "sit on the skin and reflect UV" while chemical filters "absorb into skin." This framing is outdated and inaccurate, and it matters because it is the foundation on which the "mineral is safer" narrative rests.
Both mineral and organic UV filters primarily work by absorbing UV radiation and dissipating the energy as heat. Mineral filters also scatter and reflect a smaller portion of light — which is what contributes to the white cast — but this is a secondary effect. Absorption is the dominant mechanism for both. All insoluble UV filters, whether organic or inorganic, exhibit some degree of light scattering due to their crystalline particle structure, but that reflection accounts for only around 5–10% of their total protective effect.
The distinction that actually matters is not reflect vs absorb. It is UVA1 coverage, photostability, and what the formulation does to the person wearing it.
Related Reading
The "natural" myth
A typical association with "mineral UV filters" is that they are natural compounds. This is a wrong perception, and it is worth being direct about it.
While zinc oxide and titanium dioxide are often presented as natural, the majority is produced synthetically in industrial facilities. Titanium dioxide and zinc oxide do occur in nature, but not in a form that can be used in sunscreens. The natural mineral forms require extensive chemical modification — involving high temperatures and highly reactive chemicals including sulfuric acid and chlorine — before they function as UV filters. After synthesis, the particles require surface coating with silica, aluminium hydroxide or methicone to prevent photocatalytic reactive oxygen species generation under UV exposure.
Calling this process "natural" because the starting material came from the earth is like calling a plastic bottle natural because it came from petroleum. The label refers to origin, not process.
Related Reading
Six reasons we chose organic filters
UVA1 coverage
Zinc oxide offers reasonable UVA coverage but requires approximately 20% concentration for high UVA protection. At that concentration, formulas become dense and difficult to apply evenly — and uneven application means patchy protection. Titanium dioxide provides very limited UVA1 (340–400nm) protection at all. Modern organic filters like Tinosorb S provide photostable, broad-spectrum UVA1 coverage that mineral-only formulations consistently struggle to match. Stiftung Warentest 04/2025 rated several mineral-only zinc oxide sunscreens "mangelhaft" due to inadequate UVA and UVB protection performance in independent testing — a real-world demonstration of this challenge.
Photostability
Organic filters like Tinosorb S are designed to be photostable — they maintain their protective performance under extended UV exposure. Their degradation pathways are well understood and documented over twenty-plus years of EU safety data. Zinc oxide surface coatings, which prevent photocatalytic ROS generation, do not guarantee the absence of photocatalytic activity, and their durability over a product's shelf life and in real-world conditions is not guaranteed by SPF testing.
Photocatalysis and ROS
Uncoated or inadequately coated zinc oxide and titanium dioxide nanoparticles act as photocatalysts under UV exposure, generating reactive oxygen species including superoxide anions and hydroxyl radicals. These ROS can damage cellular components including DNA. Surface coatings are applied specifically to mitigate this — but coating does not guarantee absence of photocatalytic activity. This was a concern I was not comfortable dismissing, particularly for daily use on skin over years.
Texture and compliance
The most effective sunscreen is the one you actually want to wear every day — generously, consistently, and all year. In my twelve-plus formulation variants, every mineral-only version I tested left a white cast even on medium skin tones, felt heavy, and my test group did not reapply. One variant gave me noticeable pigmentation, which was the practical confirmation of what the UVA1 coverage data already indicated. Sensory formulation is not vanity. It is the mechanism through which protection is actually delivered.
Skin inclusivity
Mineral filters, particularly at the concentrations required for high UVA protection, leave a visible white cast that ranges from subtle on very fair skin to a pronounced grey-white residue on medium, olive and deeper skin tones. Organic filters at cosmetically acceptable concentrations produce no white cast. A sunscreen that works only on a narrow range of skin tones is not formulated for everyone.
Environmental profile
The "reef-safe" label on zinc oxide products has no standardised testing requirement or regulatory definition anywhere. Research by marine ecologist Cinzia Corinaldesi confirms that zinc oxide nanoparticles cause coral bleaching via photocatalytic ROS generation — the same mechanism that makes them active as UV filters. The Globally Harmonized System classifies zinc oxide as hazardous to aquatic life. The organic filters in NAYA Everyday Sun Cream have been selected for low environmental impact profile. No sunscreen choice is unconditionally reef-safe, but the zinc oxide reef-safe label is a market positioning claim without the science to support it.
"Formulation quality matters more than filter ideology. The best sunscreen is the one that delivers verified broad-spectrum protection — and that you will apply correctly, every day."
What is in NAYA Everyday Sun Cream
The full INCI: Aqua, Dibutyl Adipate, Diethylamino Hydroxybenzoyl Hexyl Benzoate, Diethylhexyl Butamido Triazone, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Pentylene Glycol, Isoamyl Laurate, Polyglyceryl-3 Methylglucose Distearate, Cellulose, Glyceryl Stearate, Helianthus Annuus (Sunflower) Seed Extract, Xanthan Gum, Tocopherol.
13 ingredients for SPF 50+ PA++++. No fragrance, no alcohol, no silicones, no mineral filters, no preservative system beyond pentylene glycol.
- Tinosorb S — Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine Broadband UVA and UVB anchor filter. Photostable across the full 290–400nm spectrum. Over two decades of EU safety data. Oil-soluble, contributes to the elegant texture.
- Uvinul A Plus — Diethylamino Hydroxybenzoyl Hexyl Benzoate Photostable UVA filter reinforcing the UVA1 range (350–400nm). Works synergistically with Tinosorb S to close the UVA1 gap that mineral-only formulations cannot address at cosmetically acceptable concentrations.
- Uvasorb HEB — Diethylhexyl Butamido Triazone Photostable UVB and UVA2 filter. Makes a significant contribution to the SPF 50+ rating alongside the two UVA filters, delivering genuinely broad-spectrum protection.
- Helianthus Annuus (Sunflower) Seed Extract Antioxidant-rich plant extract that reduces oxidative burden from UV exposure and supports barrier lipid integrity.
- Tocopherol (Vitamin E) Lipid-soluble antioxidant that neutralises free radicals at the membrane level under UV exposure. Complements the sunflower extract antioxidant layer.
The formulation journey
I want to be clear about what this choice is not: it is not a claim that organic filters are perfect, or that mineral sunscreen should never be used. For some people with specific sensitivities, a well-formulated zinc oxide product may still be the right choice. What I am saying is that when I looked at the full evidence — UVA1 coverage, photostability, photocatalytic risk, environmental profile, texture across skin tones, and what consistent daily use actually requires — organic filters were the better answer for the product I was building.
We recognise no single solution is perfect. The EU has approved 27 UV filters after rigorous review, and the science continues to develop. I follow the research closely and remain committed to reformulating if something better emerges. Right now, this is the best option I know how to make.
Sun-protective clothing, shade, hats and sunglasses are part of the picture too. The Everyday Sun Cream is one piece of a broader sun protection approach, not a substitute for all of it.
Thank you for taking this journey with us.
With care,
Sarah
NAYA Everyday Sun Cream SPF 50+ PA++++ — three photostable organic filters, fragrance-free, no white cast, 13 ingredients.
Shop Everyday Sun Cream SPF 50+Frequently Asked Questions
Why does NAYA use organic UV filters instead of mineral?
After testing twelve-plus formulation variants including full mineral blends, organic filters were chosen because they deliver superior UVA1 coverage at cosmetically elegant concentrations, are photostable, have over twenty years of EU safety data, and produce no white cast across all skin tones. Sensory formulation is not vanity — it is the mechanism through which protection is actually delivered.
Are the organic filters in NAYA safe for sensitive skin?
Yes. Tinosorb S, Uvinul A Plus and Uvasorb HEB are all EU-approved with over twenty years of safety data. They are fragrance-free, do not cause eye stinging, and are formulated specifically for sensitive and reactive skin. Unless you have a documented sensitivity to one of these specific filters, they are suitable for sensitive, redness-prone and reactive skin.
Is mineral sunscreen really natural?
No. Every gram of zinc oxide and titanium dioxide in sunscreen is synthetically produced in an industrial facility. The starting material is mineral-origin but the production process involves high temperatures, reactive chemicals and surface engineering. The natural forms of these minerals cannot be used in sunscreen formulations without extensive chemical modification.
What UV filters are in NAYA Everyday Sun Cream?
Three photostable organic filters: Tinosorb S (Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine) for broadband UVA and UVB, Uvinul A Plus (Diethylamino Hydroxybenzoyl Hexyl Benzoate) for UVA1 reinforcement, and Uvasorb HEB (Diethylhexyl Butamido Triazone) for UVB and UVA2. No zinc oxide, no titanium dioxide, no fragrance, no silicones.
Do organic UV filters harm coral reefs?
The reef-safe label has no standardised testing requirement. Zinc oxide nanoparticles cause coral bleaching via the same photocatalytic mechanism that makes them active as UV filters — the GHS classifies zinc oxide as hazardous to aquatic life. The organic filters in NAYA were selected for low environmental impact, but no sunscreen is unconditionally reef-safe. Covering up in the water is more protective of marine ecosystems than any filter choice.
Further Reading — Sun Protection
- Mineral vs Chemical Sunscreen: What the Science Actually Shows
- The Mineral Sunscreen Myth: What the Marketing Gets Wrong
- UVA vs UVB: What Actually Ages the Skin and What SPF Really Measures
- How Safe Are Zinc Oxide and Titanium Dioxide as UV Filters?
- UV Filter Safety, Hormones and What to Actually Avoid
- How to Use Sunscreen Year-Round: The Complete Seasonal Guide
© NAYA Skincare. All information is for educational purposes and does not constitute medical advice.
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