Science
Mechanism of Action
As a broadband organic filter (UV-BB), it absorbs ultraviolet radiation within the 280–400 nm range. It converts high-energy photons into low-energy heat through electronic excitation and relaxation. Simultaneously, it acts as a photostabilizer, preventing the degradation of colors, fragrances, and sensitive active molecules caused by light exposure.
Research
Clinical Evidence
High confidence5%
Key findings
- 01 In vitro testing at a 5% concentration demonstrated SPF efficacy statistically equivalent to high-load botanical extract formulations.
- 02 Regulatory safety assessments (SCCS 2025) confirmed its safety as a UV filter in leave-on products up to a 5% threshold.
Transparency
Dusting Analysis
When used solely as a light stabilizer to protect product color or scent, concentrations below 0.5% are standard. However, to claim meaningful photoprotective benefits for the skin, it must be formulated near its regulated 5% maximum.
The Formula
Formulation
Stability
Benzophenone-5 is highly hygroscopic; moisture control during manufacturing is critical. It is the salt form of sulisobenzone, which allows for better integration into near-neutral aqueous systems compared to its acidic parent form.
Synergies
- Water-soluble antioxidants
- Chelating agents
Conflicts
- Strong oxidizing agents
- Highly alkaline environments (pH > 7.5 can shift UV absorption peaks)
Safety
Safety Profile
Regulated in the EU at a maximum of 5% (calculated as acid). While safe for the general population, its chemical class is sometimes monitored for potential endocrine concerns, though current data supports its safety at authorized levels.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An essential secondary filter and stabilizer that excels in protecting both the skin and the formula's active potency from light-induced degradation.
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References
Sources