Ph
Phytosteryl Isostearyl Dimer Dilinoleate
Phytosteryl Isostearyl Dimer DilinoleateBarrier
A rich ingredient made from plant sterols that thickens oils.
What it does
It’s made from plant sterols, isostearyl alcohol and dilinoleic acid. It thickens oils and gives balms and makeup a rich slip. It’s a close relative of phytosteryl/isostearyl/cetyl/stearyl/behenyl dimer dilinoleate.
The evidence, graded
expert consensusUS safety reviewers (final report, 2026) assessed 7 dimer dilinoleates, phytosteryl/isostearyl/cetyl/stearyl/behenyl dimer dilinoleate and phytosteryl isostearyl dimer dilinoleate among them, used to condition skin and hair and to thicken. Little is expected to pass through skin. Undiluted, some irritated skin in animal studies but not in people. They judged all 7 safe as used, asked makers to keep heavy metals within US limits, and had too little data to judge them in airbrush products.Burnett 2026 · Cosmetic Ingredient Review ↗
Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.
Browse all 1238 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.