SPF Formulation 101: What Beauty Founders Need to Know
“Sunscreen isn’t simply another skincare product. It’s one of the most technically demanding products a beauty brand can develop”
Why SPF Is Different
Developing a moisturizer and developing a sunscreen are fundamentally different challenges.
Most skincare products are judged primarily by their sensory experience and performance.
Sunscreens must do all of that while also delivering reliable UV protection, maintaining stability throughout their shelf life, complying with complex regulations, and performing consistently during manufacturing.
Consumers may experience a moisturizer differently.
SPF products must perform predictably every time.
That makes sunscreen formulation one of the most specialized disciplines in cosmetic science.
Start With Your Market, Not Your UV Filters
One of the biggest mistakes beauty founders make is beginning sunscreen development by asking, "Which UV filters should I use?"
The better question is:
Who am I building this product for?
An everyday facial moisturizer with SPF has different requirements than a beach sunscreen.
A luxury skincare brand has different priorities than a family sun care brand.
A dermatologist-developed line may emphasize clinical performance, while a clean beauty brand may prioritize mineral filters and ingredient transparency.
Before selecting a single ingredient, define your customer, your positioning, your target market, and the countries where you intend to sell.
Those decisions will influence nearly every formulation choice that follows.
Understanding SPF
SPF stands for Sun Protection Factor.
Contrary to popular belief, SPF doesn't measure how long you can stay in the sun.
It measures how effectively a product helps protect skin from UVB radiation, the portion of sunlight primarily responsible for sunburn.
Protection against UVA radiation, which contributes significantly to premature aging and long-term skin damage, is measured separately through broad-spectrum testing and other regional regulatory standards.
Modern sunscreen development isn't simply about achieving a high SPF number.
It's about creating balanced protection across the UV spectrum while maintaining cosmetic elegance.
Chemical vs. Mineral UV Filters
One of the first decisions in SPF formulation is selecting the UV filter system.
Each approach offers unique advantages and formulation challenges.
Mineral (Inorganic) Sunscreens
Mineral sunscreens rely primarily on zinc oxide, titanium dioxide, or both.
These inorganic filters provide broad-spectrum protection by interacting with ultraviolet radiation through a combination of scattering, reflection, and absorption.
Advantages include:
Broad-spectrum protection
Consumer perception as "mineral"
Often preferred by sensitive skin consumers
Increasing popularity among clean beauty brands
Challenges include:
White cast
Difficult dispersion
Texture optimization
Stability considerations
Higher viscosity
Sensory challenges
Creating an elegant mineral sunscreen is often considerably more difficult than consumers realize.
Organic (Chemical) UV Filters
Organic UV filters absorb ultraviolet radiation before it damages the skin.
Modern systems frequently combine multiple filters to achieve balanced UVA and UVB protection while maximizing photostability.
Advantages include:
Superior cosmetic elegance
Greater formulation flexibility
Easier achievement of high SPF values
Reduced whitening
Challenges include:
Regulatory differences by country
Consumer perception
Filter compatibility
Photostability
Ingredient limitations
Many successful commercial sunscreens combine multiple UV filters to optimize overall performance.
Choosing the Right UV Filter System
There is no universally "best" sunscreen technology.
Every UV filter system involves trade-offs between performance, aesthetics, regulatory acceptance, consumer expectations, manufacturing complexity, ingredient transparency, and cost.
The right formulation begins with understanding your market.
A clean beauty brand may prioritize mineral filters and ingredient transparency.
A luxury skincare brand may prioritize cosmetic elegance and invisible wear.
A global brand may need UV filters that can be adapted across multiple regulatory markets.
Many modern formulations also take a hybrid approach, combining carefully selected mineral and organic UV filters to balance broad-spectrum protection, aesthetics, photostability, and regulatory flexibility.
As a formulator, I have extensive experience developing zinc oxide sunscreen systems, so I naturally appreciate the advantages mineral technologies can offer. Zinc oxide provides excellent broad-spectrum protection and aligns well with many modern skincare philosophies. Developing elegant zinc oxide formulations, however, requires considerable formulation expertise to optimize dispersion, texture, aesthetics, stability, and manufacturability without compromising performance. At the same time, I also recognize that no single technology is right for every brand or every consumer.
One exciting area of innovation is combining zinc oxide with next-generation UV filters such as Bemotrizinol (BEMT). These hybrid systems can improve cosmetic elegance, enhance photostability, and may reduce or eliminate the need for older UV filters such as octocrylene, depending on the formulation and target market.
The possibilities are nearly endless.
Modern sunscreen formulation offers more possibilities than ever before, allowing brands to design UV protection systems that align with their performance goals, ingredient philosophy, customer expectations, and regulatory markets.
The best sunscreen isn't built around trends or ingredient lists.
It's built around transparency, thoughtful formulation, and alignment with your customer, your regulatory markets, and your brand philosophy.
Most importantly, every sunscreen formulation must be validated through standardized SPF testing. Regardless of how promising a formula looks on paper or performs in the laboratory, only finished-product testing can determine the SPF and support the claims made on the label.
“Every sunscreen has strengths and compromises. Great formulation is about understanding those trade-offs and designing the right solution for your customer.”
The Rise of Next-Generation UV Filters
Sunscreen technology continues to evolve.
One of the most significant advances has been the development of newer-generation UV filters that offer improved photostability and broader UV coverage.
One example is Bemotrizinol (BEMT).
Bemotrizinol has attracted significant attention because of its excellent photostability and ability to stabilize other UV filters within a formulation.
For formulators, technologies like BEMT create opportunities to improve both product performance and long-term stability.
However, availability and regulatory approval vary by market.
Understanding where and how these ingredients can be used is an essential part of global SPF development.
(For a deeper discussion of Bemotrizinol, read our complete article on BEMT and next-generation UV filters.)
SPF Formulation Is More Than Choosing UV Filters
Many founders assume sunscreen development begins by selecting UV filters.
In reality, UV filters are only one part of the equation.
Successful SPF products also depend on:
Filter dispersion
Emulsion design
Film formation
Water resistance
Photostability
Antioxidant systems
Packaging compatibility
Manufacturing process
Particle distribution
Rheology and suspension stability
Long-term storage stability
Every one of these variables can influence finished product performance.
An SPF formulation is a complete system—not simply a collection of ingredients.
Regulatory Complexity
Unlike many cosmetic products, sunscreens are regulated differently throughout the world.
In the United States, most sunscreen products are regulated as over-the-counter (OTC) drugs and must comply with FDA monograph requirements.
Other regions classify sunscreens as cosmetics while applying different approved UV filter lists and testing standards.
A formula that is compliant in one country may require significant changes before it can be sold in another.
Global product development requires understanding these regulatory differences from the beginning.
For brands planning international expansion, regulatory strategy should be considered during formulation—not after commercialization.
Why SPF Development Requires Specialized Expertise
Sunscreen formulation combines cosmetic chemistry, pharmaceutical science, regulatory knowledge, manufacturing, and analytical testing.
Unlike many skincare products, successful sunscreen development requires validating that the finished product performs exactly as intended.
Every formulation decision can influence SPF performance.
Changing a dispersant.
Adjusting viscosity.
Selecting different emulsifiers.
Changing manufacturing equipment.
Even subtle formulation changes may require additional validation.
This is one reason sunscreen development typically takes longer than many other skincare categories.
It's also why experienced SPF formulators spend significant time evaluating stability, commercialization, manufacturing scale-up, and regulatory strategy before a product ever reaches consumers.
The Cosmeta Perspective
At Cosmeta, we believe sunscreen development should begin long before UV filters are selected.
It begins with understanding your market.
Your customer.
Your positioning.
Your regulatory goals.
And your long-term commercialization strategy.
Whether we're developing a mineral sunscreen, exploring next-generation UV filters like Bemotrizinol, or engineering elegant zinc oxide systems, our objective remains the same.
Create products that protect exceptionally well.
Feel beautiful on the skin.
Manufacture consistently.
And position our clients for long-term success.
Because successful SPF products aren't created by chasing the highest SPF number.
They're created by thoughtfully balancing science, safety, regulatory strategy, manufacturing, and customer experience.
“The best sunscreen isn’t simply the one with the highest SPF. It’s the one people enjoy using every single day.”
