Vitamin C derivative (antioxidant)
Tetrahexyldecyl Ascorbate
INCI: Tetrahexyldecyl Ascorbate·Studied at 1–20% (in oil)·Moderate evidence
An oil-soluble, more shelf-stable vitamin C ester used as a gentler alternative to L-ascorbic acid, flagged for antioxidant support and the appearance of brightness, though derivatives carry thinner evidence than pure vitamin C.
Studied for
- ·Antioxidant support against visible environmental dullness
- ·The appearance of brighter, more even-looking skin
How it’s thought to work
An esterified vitamin C studied for association with brightness-related appearance benefits; it is more stable and less pH-fussy than L-ascorbic acid, but the direct evidence is more limited.