Common Name(s): Katp,combined vitamins c+e ester
CAS Number: 108910-78-7
DESCRIPTION
What It Does: Delivers synergistic vitamin c and e antioxidant power from a single stable molecule.
Why It's Used: Where proven c+e synergy is desired without the formulation challenges of combining pure ascorbic acid and tocopherol.
How It Works: Enzymatic hydrolysis releases ascorbate and tocopherol simultaneously. ascorbic acid regenerates oxidized tocopheryl radical creating a sustained antioxidant cycle.
Typically Found In: Premium antioxidant serums,anti-photoaging formulations
TECHNICAL DETAILS
Primary Category: Active ingredient โ vitamin c derivative
Secondary Functions: Synergistic antioxidant,photoprotection
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.5%โ3%
SOURCING & ETHICS
Vegan Status: Conditional โ tocopherol source varies
Halal Status: Yes
Source Notes: Synthetically produced vitamin c derivative.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 โ very low
Comedogenicity Rating: 0/5 โ non-comedogenic
Sensitivity Concerns: Non-irritating; suitable for all skin types.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Excellent safety profile. ewg score: 1.
Works Well With: Tocopherol,ferulic acid,niacinamide,spf
Avoid Combining With: No significant incompatibilities
SCIENTIFIC NOTE
The combined c+e ester exploits the vitamin c regeneration of oxidized vitamin e cycle while providing superior stability vs combining free vitamins in one formulation.
Last Verified: Cosing database,pinnell vitamin c+e synergy review
Primary Sources: 2026-03-12