Common Name(s): Porphyra 334,porphyra 334,uv filter cosmetic sunscreen,photoprotection active
CAS Number: N/a
DESCRIPTION
What It Does: Absorbs uv radiation in the 280-400 nm range and dissipates the energy as heat, preventing uv-induced skin dna damage, photocarcinogenesis, premature photoageing, and formulation ingredient photodegradation.
Why It's Used: Uv filters provide the primary active protection in sunscreens โ the uv absorbing chromophore intercepts photons before they reach viable skin cells, preventing the thymine dimer formation and oxidative dna damage that leads to photocarcinogenesis and photoageing.
How It Works: Uv filter absorption through specific chromophore electronic transition: pi-pi* (aromatic uv absorbers) or n-pi* (carbonyl uv absorbers) converting photon energy to vibrational heat energy through rapid internal conversion from the excited state.
Typically Found In: Sunscreens,uv protective products
TECHNICAL DETAILS
Primary Category: Active ingredient โ cosmetic active
Secondary Functions: Skin conditioning
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: Per annex vi maximum
SOURCING & ETHICS
Vegan Status: Yes
Halal Status: Yes
Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 โ very low
Comedogenicity Rating: 0/5 โ non-comedogenic
Sensitivity Concerns: Well-tolerated by most skin types.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Good safety profile at recommended concentrations. ewg score: 1โ2.
Works Well With: Standard skincare actives
Avoid Combining With: No known significant incompatibilities
SCIENTIFIC NOTE
Uv filter regulatory status varies significantly by market โ eu annex vi approves a wider range of filters than fda otc drug monograph (us). formulators must verify each filter's approval status and maximum concentration in each target market before formulating.
Last Verified: Eu regulation 1223/2009 annex vi,porphyra 334 uv filter review
Primary Sources: 2026-03-22