Advocacy Is Not Opposition: What Happened When We Questioned a Zinc Oxide Headline

Advocacy Is Not Opposition | Questioning Zinc Oxide Sunscreen Research | Beautélanin®

Scientific advocacy does not require rejecting research. Sometimes it simply requires asking that the public be told exactly what the research established and what it did not. Advocacy is often imagined as something loud: a protest, a public confrontation, a demand issued after every quieter approach has failed.

But advocacy can also begin with a careful question. Who was included? What exactly was tested? What conclusion does the evidence support? What might a consumer reasonably believe after reading this headline?

Those questions matter in skincare because scientific findings do not remain inside laboratories. They become headlines, marketing claims, ingredient blacklists, social-media warnings, purchasing decisions, and professional recommendations. By the time a nuanced study reaches the public, its findings may have been reduced to a sentence that says far more than the research itself.

That is what concerned us when we encountered an Oregon State University article about zinc oxide and sunscreen phototoxicity.

The Headline That Raised Our Concern

The original public-facing article carried a sweeping message: sunscreen containing zinc oxide could lose much of its effectiveness and become toxic after two hours of ultraviolet exposure. That wording was alarming, particularly for a company developing a mineral sunscreen for melanin-rich skin. But alarm is not analysis.

We read the underlying study, Zinc Oxide-Induced Changes to Sunscreen Ingredient Efficacy and Toxicity Under UV Irradiation, published in Photochemical & Photobiological Sciences. The researchers created five mixtures containing small-molecule ultraviolet filters modeled after ingredients used in U.S. and European sunscreens. They tested those mixtures before and after adding micro- or nano-sized zinc oxide and exposing them to ultraviolet radiation for two hours.

The results were significant. The small-molecule mixtures were generally photostable without zinc oxide. When zinc oxide was introduced, however, the researchers observed substantial degradation of the small-molecule filters, loss of UVA protection, and increased toxicity in embryonic zebrafish assays after irradiation. The study therefore raised a legitimate concern about combining zinc oxide with certain small-molecule UV filters without evaluating how the complete mixture behaves under light exposure. Read the published study.

But that is not the same as proving that every sunscreen containing zinc oxide becomes ineffective or toxic after two hours.

The experiment did not evaluate a zinc-oxide-only mineral sunscreen. It did not test a finished commercial sunscreen as sold to consumers. It did not establish toxicity to human skin under ordinary topical use. The toxicity findings came from a zebrafish model, which is valuable for detecting biological activity and identifying potential hazards, but does not automatically predict the same result in a human dermal system.

That distinction was too important to ignore.

Why the Distinction Matters for Melanin-Rich Skin

Consumers with melanin-rich skin have already been neglected by sunscreen research, education, formulation, and marketing.

For generations, many were told that Black skin did not need sunscreen. When products were finally marketed to us, they frequently left white or gray residue, ignored undertone diversity, centered visible sunburn as the primary measure of injury, or treated cosmetic elegance on deeper skin as an afterthought.

We should therefore be especially careful when communicating sunscreen research.

People deserve to understand genuine concerns about photostability and ingredient interactions. They also deserve protection from exaggerated conclusions that may discourage sunscreen use altogether.

We should not replace one oversimplification, “mineral always means safe”, with another “zinc oxide becomes toxic in sunlight.” Neither statement reflects the behavior of a complete formulation.

At Beautélanin®, our concern was not to defend zinc oxide merely because we had chosen to work with it. Advocacy does not mean protecting a preferred ingredient from uncomfortable evidence. It means refusing to let fear, marketing reputation, or imprecise language substitute for what the evidence actually demonstrates.

We Wrote the Emails

We contacted both the study’s Oregon State researcher, Professor Robyn Tanguay, and the author of the university’s public-facing article.

To Professor Tanguay, we asked questions about:

• Whether the zinc oxide particles were coated or surface-treated

• Whether the same concerns would be expected in a zinc-oxide-only formulation

• How dispersion, surface treatment, antioxidants, iron oxides, the formulation vehicle, and packaging might affect photoreactivity

• What photostability and phototoxicity testing a responsible formulator should request

• Whether the zebrafish results were being followed by human-relevant dermal research

We separately asked Oregon State’s communications representative to clarify the public article. Our concern was that the headline could lead readers to believe that zinc oxide itself had been proven to become ineffective and toxic after two hours of sunlight.

We explained that the research involved particular mixtures under particular experimental conditions and that accessibility in science communication should not come at the expense of a distinction that materially changes what the public believes. Then we waited.

The Researcher Responded

Professor Tanguay explained that the study was designed to investigate potential interactions among UV light, zinc oxide, and chemicals present in certain sunscreen formulations.

Her laboratory uses zebrafish as a sensitive and rapid indicator of chemical bioactivity. The model has demonstrated value in detecting substances known to be toxic to humans and can help researchers prioritize which mixtures or conditions require further investigation. But, importantly, she acknowledged that zebrafish findings are not necessarily predictive of toxicity in a human system.

She also clarified a central point: zinc oxide alone did not produce toxicity, with or without UV exposure, under the conditions studied.

The increased toxicity appeared when zinc oxide and the small molecules were formulated together and exposed to ultraviolet light. The mixture became more biologically active than the original mixture.

That answer did not dismiss the study’s concern. It defined it more accurately.

The concern was not simply “zinc oxide is toxic.” The concern was that ingredients tested separately may behave differently when combined into a formulation and exposed to the very condition in which a sunscreen is intended to function: sunlight.

This was a proof-of-concept study, not a final verdict on every sunscreen containing zinc oxide.

Then the Public Article Changed

Following our outreach, the Oregon State article appeared with a more precise headline:

“Zebrafish study: After two hours, some sunscreen mixtures that include zinc oxide lose effectiveness, become toxic.”

The addition of “some sunscreen mixtures” matters. So does identifying the zebrafish model at the beginning rather than allowing readers to assume that human toxicity had been demonstrated.

More significantly, the article now includes an express clarification that the research did not test a zinc-oxide-only mineral sunscreen, a finished commercial sunscreen, or toxicity following topical application to human skin. It explains that the findings raise concerns about particular ingredient combinations and support complete-formula photostability testing, not the conclusion that every zinc-oxide sunscreen becomes ineffective or toxic after two hours. Read the updated Oregon State article.

That clarification closely reflects the concerns raised in our correspondence.

We cannot speak to every internal discussion that led to the revision. We can say that we asked for greater precision, and the public-facing article now communicates the study’s scope far more accurately.

That is why advocacy matters.

Advocacy Is Part of Scientific Responsibility

We are sometimes taught that credentials determine who is permitted to question science. They do not.

Expertise should be respected. Research methods should be taken seriously. Questions should be grounded in evidence. But science is not strengthened when everyone outside a laboratory is expected to read, accept, and remain silent.

A formulator may notice that the tested mixture is not equivalent to a finished emulsion. An esthetician may ask whether visible redness is an adequate endpoint for melanin-rich skin. A consumer may identify language that overstates what an animal model can establish about humans. An attorney may recognize when a public statement extends beyond the evidence underneath it. Each perspective can expose a different gap.

Advocacy is not an accusation that researchers acted in bad faith. It is participation in the process by which research is interpreted, challenged, communicated, and improved.

Professor Tanguay did not respond defensively. She explained the role and limitations of the zebrafish model, clarified what produced the observed toxicity, and reinforced the importance of studying mixtures rather than relying exclusively on individual ingredient data.

That response gave us something more useful than reassurance. It gave us a sharper research question.

What This Means for Beautélanin®

This exchange has strengthened, not weakened, our commitment to rigorous sunscreen development.

We will not assume that zinc oxide is automatically safe because it is mineral, natural, non-nano, or familiar. Particle size alone does not determine biological behavior. Crystal structure, surface chemistry, coatings, dispersion, surrounding ingredients, irradiation conditions, and the formulation vehicle may all matter.

We also will not treat a zebrafish hazard signal as proof that a zinc-oxide-only sunscreen is toxic to human skin. Instead, we will continue asking what the complete formulation does:

• Before UV exposure

• During irradiation

• After irradiation

• Across UVA, UVB, and visible-light wavelengths

• In chemical, environmental, and human-relevant biological models

• Across skin representing a measured range of melanin densities

Our commercial mineral sunscreen prototype will remain separate from any laboratory-only exploratory research. Novel concepts must earn their place through optical, physicochemical, toxicological, phototoxicological, and regulatory evaluation. “Melanin-inspired” will never be treated as a synonym for safe.

This exchange may also open the door to research collaboration. The same laboratory expertise used to detect changes in mixture bioactivity could help identify which experimental formulations deserve further testing in reconstructed human epidermis or viable ex vivo skin, and which should be abandoned before they reach people.

One Email Can Matter

The beauty industry frequently tells independent founders, estheticians, and consumers to trust the science.

We believe in something more demanding: Read the science. Examine the method. Respect what the evidence establishes. Name what it does not. Ask the question anyway.

Advocacy does not always begin with certainty. Sometimes it begins with enough knowledge to recognize that something has been stated too broadly, and enough courage to request precision from people with far more institutional power.

We asked.

A scientist answered.

The public explanation became clearer. And the conversation may now lead to a new research collaboration. That is not opposition to science. That is what engagement with science should look like.

No fear-based marketing. No ingredient mythology. No erasure of complexity. Only evidence, accountability, and the willingness to ask better questions.