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.
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%