Cited skincare — every flag names its source, no upsell.
As

Ascorbyl Tetraisopalmitate

Ascorbyl Tetraisopalmitate · Tetrahexyldecyl AscorbateAntioxidant

Oil-soluble vitamin C derivative. Stable, well-absorbed, formulates cleanly in anhydrous serums.

What it does

Ascorbyl tetraisopalmitate is the most lipid-friendly vitamin C derivative — its four palmitic-acid tails make it oil-soluble and well-suited to anhydrous formulations. It's stable, doesn't sting, and converts to active ascorbic acid on the skin at a meaningful rate. Common in higher-end vitamin C serums marketed for sensitive skin or as a 'next-generation' vitamin C.

The evidence, graded

strongVitamin C shows brightness and tone-evening improvements in 4–8 weeks. Collagen-mediated firmness benefits take 12+ weeks. Photoprotection benefits are immediate when paired with sunscreen.Humbert 2003 · Experimental Dermatology ↗
emergingVitamin C, vitamin E, and ferulic acid show synergistic photoprotection. The combination is more stable and doubles photoprotection compared to vitamin C alone.Lin 2005 · Journal of Investigative Dermatology ↗

Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.

Also known as

atip, tetrahexyldecyl ascorbate, thd ascorbate, vitamin c, ascorbic acid

Pairs worth knowing

Vitamin E (Tocopherol) · works together ↗Ferulic Acid · works together ↗Squalane · works together ↗

Browse all 668 ingredients — grouped by what they do, each with whatever evidence we can cite.

This page is public so a shared ingredient card always has its sources behind it — and so you can check them without an account.
Want more like this?
Every evidence-based flag cites its source, Drop tells you when your routine is complete, and it helps you simplify — instead of selling you more. The app launches on iOS and Android in October 2026. Rate my routine works today at /rate — no sign-in.
See what Drop doesHow Drop works