Short answer: sunscreen is the one product in your skincare line that is not regulated as a cosmetic in every market. In the United States it is an over-the-counter drug, which changes the facility registration, the label, the claims you may make and how SPF must be substantiated. A supplier who describes sunscreen as "just another cream with UV filters" has not understood the category, and the mistake will surface at customs or at the testing lab.
This guide covers what makes the category different, how the formulation actually works, how SPF and broad-spectrum claims are established, and where first runs go wrong.
Why sunscreen is a different animal
Almost everywhere else in skincare, the product is a cosmetic: it cleans, beautifies or alters appearance, and the regulatory burden is about safety and labelling. Sunscreen adds an efficacy claim — it prevents sunburn, and by extension reduces UV damage — and regulators treat that claim seriously.
| Market | Regulatory status | What it triggers |
|---|---|---|
| United States | OTC drug (monograph) | FDA drug establishment registration, drug facts label, NDC, verified SPF |
| European Union | Cosmetic | Annex VI filter list, PIF, CPNP notification, claim substantiation |
| Most of Asia | Cosmetic | Approved filter list, efficacy testing per local method |
| Other regions | Varies | Often modelled on EU or ASEAN requirements |
The practical consequence: a formula designed for the EU market may not be sellable in the US as-is, not because of the ingredients' safety but because the permitted filter list differs.
The UV filter list is the real constraint
There is a divide between markets that have access to newer organic filters and the United States, where the approved set is largely older.
Broadly available in the US: avobenzone, homosalate, octisalate, octocrylene, oxybenzone, ensulizole, and the mineral filters titanium dioxide and zinc oxide.
Widely used in the EU and Asia, not yet approved for US use: several newer filters that deliver high UVA protection and photostability at lower concentrations.
This is why US sunscreen formulations lean heavily on avobenzone plus a photostabiliser, or on mineral filters, and why achieving high UVA protection in the US is harder and more expensive than in Europe. It is a regulatory constraint, not a formulation skill gap.
A manufacturer should be able to tell you, for your target market, which filters are available and what that does to your achievable protection level and cost.
How the formulation actually works
A sunscreen is a dispersion and film problem before it is a chemistry problem.
Mineral systems (zinc oxide, titanium dioxide) depend on particle dispersion. Undispersed particles scatter light unevenly, which is how you get whitening, patchiness and an SPF that tests lower than formulation maths predicts. Achieving transparent mineral protection is a dispersion and surface-treatment problem.
Organic systems depend on photostability. Avobenzone degrades under UV unless stabilised, so the stabiliser is not an optional extra — it is what makes the SPF hold during use, not just at the moment of application.
The film is what actually protects. Film thickness, uniformity and how the product spreads on skin all affect real-world SPF. A formula that tests well in a lab but spreads unevenly on skin delivers less protection than the number on the pack suggests.
Water resistance is a separate design decision. It is achieved through polymer systems that keep the film intact when wet, and it must be tested, not assumed.
SPF and broad-spectrum testing
SPF is not calculated. It is measured on human volunteers using a defined protocol, comparing the time to erythema on protected versus unprotected skin. Key implications:
- Testing uses the production formula — the same formula, made the same way, that will go in the pack. A change in the formula after testing invalidates the test.
- The test result is what you may claim. You may not claim a higher number than you tested. Over-claiming is a regulatory violation, not a marketing liberty.
- Broad-spectrum is a separate claim. In the US, it is derived from the critical wavelength of the absorption curve — a product can have a high SPF and still fail the broad-spectrum test. In Europe, UVA protection is expressed as a ratio of UVA to UVB protection.
- Water resistance is a third test, with its own protocol and its own claim language.
Testing is therefore a scheduling item: it consumes product, consumes calendar time, and must be sequenced after the formula is frozen.
Where first runs go wrong
1. Treating it as a cosmetic for compliance. The US pathway for a sunscreen is a drug pathway. Facilities have to be registered accordingly and labels have to carry drug facts. Discovering this after a pack is printed is expensive.
2. Claiming a number that was not tested. SPF claims must be supported by testing on the finished formula. Interpolating from ingredient levels is not substantiation.
3. Changing the formula after testing. A "small" adjustment — a different thickener, a different emollient — changes the film and can change the measured SPF. If the formula changes, the test does not carry over.
4. Forgetting the pack in the stability program. Sunscreen is particularly sensitive to heat and to interaction with pack materials. Compatibility testing is not optional here.
5. Assuming a higher filter load buys a proportionally higher SPF. SPF rises with filter concentration but flattens quickly, and increasing load degrades texture and increases cost. Past a certain point you are adding expense for a number you cannot claim.
6. Ignoring the whitening problem in mineral systems. This is a dispersion engineering problem with real solutions; it is not an unavoidable property of mineral filters.
What to prepare before approaching a manufacturer
- Target markets, because the filter list and the compliance path depend on them.
- Target SPF and whether you need broad-spectrum and water-resistance claims, because each is a separate test.
- Preferred filter system (mineral, organic, hybrid) or an open mind about it.
- Pack format, since sunscreen is heat-sensitive and pack compatibility matters more here than in most categories.
- Your launch deadline, so the testing schedule can be planned backwards from it — see our manufacturing timeline guide for how testing sits in the critical path.
A manufacturer who asks for all six is treating the category seriously. One who asks only for the SPF number is quoting a product, not a compliant one.
FAQ
Q: Is sunscreen a cosmetic or a drug? A: It depends on the market. In the US it is an over-the-counter drug, which triggers FDA drug establishment registration, a Drug Facts label and verified SPF. In the EU and most of Asia it is regulated as a cosmetic against an approved UV filter list.
Q: Can one sunscreen formula be sold in both the US and the EU? A: Not as-is. The permitted filter lists differ, and several newer filters widely used in the EU and Asia are not approved for US use, so US formulations lean on avobenzone plus a photostabiliser or on mineral filters.
Q: How is an SPF number established? A: It is measured on human volunteers using a defined protocol, on the production formula — it is never calculated from ingredient levels. You may not claim a higher number than you tested, and over-claiming is a regulatory violation rather than a marketing liberty.
Q: Why does my mineral sunscreen leave a white cast? A: Whitening is a dispersion problem, not an unavoidable property of mineral filters. Undispersed zinc oxide or titanium dioxide scatters light unevenly, which also depresses the SPF the product measures.
Q: Can the formula be adjusted after SPF testing? A: No. A different thickener or emollient changes the film, and the film is what protects — so the measured SPF can move. If the formula changes, the test does not carry over and has to be repeated.
Q: Does a higher UV filter load always give a higher SPF? A: No. SPF rises with filter concentration but flattens quickly, and increasing the load degrades texture while adding cost. Past a certain point you are paying for a number you cannot claim.