Sorbitan Isostearate
No meaningful concern for most people; irritation is possible but rare.
What it is
This is sorbitol esterified with isostearic acid, a branched fatty acid that stays liquid and resists oxidation. The branching gives it a lighter, less greasy feel than straight-chain sorbitan esters, which is why it turns up in cleansing balms and make-up removing masks.
What it does well
Helps oil-based cleansers emulsify and rinse off
It allows a balm or oil to turn milky with water so it lifts away rather than leaving a film.
Moderate evidence
Where the EU stands
No specific restriction
No EU restriction on use or concentration in cosmetics.
Regulation (EC) No 1223/2009 - no annex entry · source ↗
Masks that contain Sorbitan Isostearate
Abib
Collagen Gel Mask Heartleaf Jelly
34th of 43 on the label
below ≈1%
Abib
Collagen Gel Mask Jericho Rose Jelly
34th of 43 on the label
below ≈1%
Beauty of Joseon
Ground Rice and Honey Glow Mask
34th of 35 on the label
below ≈1%
Biodance
Hydro Cera-nol Real Deep Mask
38th of 65 on the label
below ≈1%
Caudalie
VinoHydra Moisturising Cream Mask (Masque-Creme Hydratant)
28th of 32 on the label
below ≈1%
Erborian
BB Shot Mask
21st of 34 on the label
below ≈1%
Rodial
Vit C Energising Face Mask
18th of 30 on the label
below ≈1%
Schaebens
Tuchmaske Tonerde
29th of 35 on the label
below ≈1%
THALGO
Klärende Intensiv-Maske
20th of 32 on the label
below ≈1%