Ascorbyl Tetraisopalmitate is a stable, oil-soluble derivative of Vitamin C known for its high efficacy in brightening skin and reducing pigmentation. Compared to conventional Vitamin C, it is milder, more stable, and less prone to oxidation, while effectively inhibiting tyrosinase activity and decreasing melanin production to promote a more even skin tone.

Supplied as a colorless to pale yellow liquid, it is soluble in oil, making it suitable for incorporation into serums, creams, oils, and other oil-based skincare formulations. With a recommended dosage of 0.5–4.0%, it delivers potent brightening effects while maintaining formulation stability and safety.