A custom sunscreen can give a skincare brand more control over protection level, texture, finish, ingredients, packaging, and market positioning than a standard stock formula. EU guidance states that SPF 30 absorbs about 97% of UVB radiation, while recommended UVA protection should reach at least one-third of the labeled SPF. U.S. FDA rules also require water-resistance claims to be supported for either 40 or 80 minutes. A well-developed formula can therefore compete on measurable performance rather than packaging alone. For a brand, the commercial difference comes from combining verified protection with a product people are comfortable applying every day.
Sunscreen earns a useful place in a skincare range because application is frequent and the amount used is relatively high. European Commission guidance uses 2 mg/cm² as the test application level, roughly 36 g for the exposed body of an average adult. The same guidance notes that applying only half the tested amount may reduce protection by as much as two-thirds. A 50 mL facial product can therefore be used much faster than a 30 mL serum when consumers apply an adequate amount each morning.
Frequent use also gives brands more chances to create repeat purchases, but repeat use depends heavily on skin feel. A sunscreen that leaves grease, visible residue, tackiness, or pilling under foundation may be used less often even when its SPF result is good. In a 2011 follow-up of 1,621 Australian adults originally randomized from 1992 to 1996, the daily-use group recorded 11 new primary melanomas compared with 22 in the discretionary-use group. Regular application, rather than occasional ownership of the product, was the behavior studied.
That usage issue should shape formulation work from the start. A custom sunscreen can be adjusted around viscosity, spread, dry-down time, shine, fragrance, film feel, white cast, and compatibility with makeup. SPF alone gives little information about these properties. EU guidance notes that SPF 15 absorbs about 93% of UVB radiation and SPF 30 about 97%, so moving between SPF numbers produces a smaller change in UVB absorption than many shoppers assume. Sensory differences can therefore matter greatly when two products already offer suitable protection.
A useful development brief can translate those sensory goals into measurable product requirements:
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Facial fluid: 40–60 mL, fast-spreading, low-tack finish, designed for daily use.
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Dry-skin lotion: SPF 30–50, richer emollient phase, humectants such as glycerin or sodium hyaluronate.
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Outdoor lotion: SPF 50, stronger film formation, tested 40- or 80-minute water resistance for the U.S. market.
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Makeup-friendly sunscreen: low pilling, controlled shine, even film after layered skincare.
FDA labeling permits water-resistant claims only when the product passes the specified 40- or 80-minute test procedure. “Waterproof” and “sweatproof” are not permitted claims.
Protection design also has to cover more than UVB. European Commission Recommendation 2006/647/EC states that UVA protection should reach at least one-third of the SPF and recommends a wavelength threshold of at least 370 nm for broad coverage. An SPF 30 product designed for that framework therefore needs UVA protection of at least 10, while SPF 50 needs at least about 16.7. Building the formula around both parts helps prevent a brand from treating the front-label SPF number as the entire performance specification.
A higher SPF number does not remove the need for enough product, even film formation, reapplication, or UVA testing. In 2006, European guidance specifically warned that no sunscreen provides 100% UV protection and advised against “total protection” style claims.
Testing should therefore be planned before packaging copy is approved. ISO 24444:2019 provides an internationally recognized in-vivo method for determining SPF and was amended in 2022. ISO 24443:2021 provides an in-vitro method for characterizing UVA protection, including UVA-PF, spectral absorbance, and wavelength calculations. A manufacturer developing custom sunscreen for several countries should identify the target market first because test methods, permitted filters, product classification, claims, and label requirements are not identical across jurisdictions.
The U.S. provides a useful example of why market selection comes before formula approval. FDA broad-spectrum testing measures UV transmittance from 290 to 400 nm and uses sunscreen applied to PMMA plates at 0.75 mg/cm². The method requires at least five mean-transmittance measurements on each of three plates. Water-resistance testing is separate: a 40-minute claim uses two 20-minute water-immersion periods, while an 80-minute claim requires four immersion cycles. A marketing team cannot reasonably add those statements after production without supporting test data.
| Development area | Useful specification | Why it matters |
|---|---|---|
| SPF | 30, 50, or 50+ depending on market | EU guidance places SPF 30 in “high protection” and 50+ in “very high protection” |
| UVA | At least 1/3 of SPF under EU guidance | Prevents UVB-heavy product positioning |
| Application | Reference testing commonly uses 2 mg/cm² | Lower real-world application can sharply reduce delivered protection |
| Water resistance | 40 or 80 minutes in U.S. testing | Claim must match completed test |
| Stability | Multiple temperatures and package checks | Helps detect separation, viscosity change, odor change, or dispensing problems before launch |
Formula differentiation can then move beyond sunscreen filters. Niacinamide, glycerin, tocopherol, ceramides, panthenol, or selected botanical materials may support a skincare-oriented concept when their concentration, stability, safety assessment, and claims are appropriate. Adding 8 or 10 fashionable ingredients only for the label can make the formula harder to preserve and stabilize without giving users a noticeable benefit. A shorter supporting system at meaningful use levels is often easier to explain, manufacture, test, and reproduce between production batches.
Packaging deserves the same level of attention because a sunscreen formula may contain oils, solvents, UV filters, powders, film formers, and emulsifiers that interact differently with pumps, tubes, seals, and printed components. A 50 mL airless pump may suit a premium facial emulsion, while a 100–200 mL tube may be more practical for body use. Compatibility work should examine leakage, paneling, clogging, discoloration, loss of decoration, dose consistency, and formula changes after storage rather than approving a package from appearance alone.
Price planning should also start before the final sample. If a product is expected to retail for $30, formula cost is only one part of the commercial structure. Primary packaging, carton, filling, SPF/UVA testing, stability work, freight, warehousing, distributor margin, retailer margin, sampling, and promotional spending all use part of that $30. Raising the formula cost by $0.50 may be reasonable when it noticeably improves spread or residue, while spending the same amount on decorative ingredients that consumers cannot feel may add little to repeat purchase.
Custom development also lets a brand separate products by real use case instead of changing only the label. One range could contain a 50 mL daily facial fluid, a tinted SPF 50 option, a 100 mL water-resistant outdoor lotion, and a larger body sunscreen. Each SKU should differ in application, finish, package size, or tested performance. By comparison, four near-identical SPF 50 products can increase inventory, packaging minimums, and forecasting work without giving customers a clear reason to choose between them.
Manufacturing capability matters more as the range expands. A supplier should be able to explain how pilot samples are transferred to commercial batches, how raw materials are qualified, how mixing temperature and shear are controlled, and how finished batches are checked before filling. Sunscreen performance is sensitive to film uniformity and ingredient dispersion, so a laboratory sample made at 1–5 kg does not automatically behave identically when production moves to several hundred kilograms.
Before approving a supplier, a brand can ask for specific information rather than general assurances:
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Which SPF and UVA methods are normally used, including ISO 24444:2019 or ISO 24443:2021 where relevant?
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Can the facility support 40- or 80-minute water-resistance testing for a U.S. product?
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What minimum and normal batch sizes apply to the selected package?
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What stability, microbiological, preservative, and packaging-compatibility checks are included?
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How are changes in UV filters, raw-material suppliers, or packaging components documented?
The answers affect launch timing, cost, and the ability to reproduce the same product after the first production run.
Brand credibility is strengthened when claims stay close to measured performance. FDA directions require sunscreen to be applied generously 15 minutes before sun exposure and generally reapplied at least every 2 hours, with additional instructions after swimming, sweating, or towel drying. FDA also notes that up to 80% of UV radiation can pass through clouds. Packaging and website copy can educate users with information like this instead of relying on broad statements about “all-day” protection that testing does not support.
A custom sunscreen is therefore most useful when product development starts with a defined user, market, application experience, test plan, package, and retail price. In the 1,621-person Australian study, regular sunscreen use was associated with 11 melanomas versus 22 in the discretionary-use group during follow-up, while invasive melanoma cases were 3 versus 11. Those numbers place daily use at the center of product design: protection has to be tested, but the formula also has to feel good enough that people keep applying it. A brand gains more from a sunscreen people finish and repurchase than from a long specification sheet that does not translate into regular use.