What it is
This ingredient is formed by esterifying triglycerin (polyglyceryl-3) with ricinoleic acid, the principal fatty acid of castor oil. The resulting nonionic emulsifier is useful for stabilizing emulsions and dispersing pigments, which makes it well suited to cushion sunscreens and tinted products. It also imparts a conditioning, cushioned feel.
Safety & warnings
Polyglyceryl esters of this type are nonionic and typically mild and well tolerated. Because the fatty-acid portion derives from castor oil, those with a known castor-derivative sensitivity may wish to take note, though such reactions are uncommon.
Origin & sourcing
Synthetic; made by combining glycerin (as polyglycerin-3) with ricinoleic acid, which is derived from castor oil.
Questions everyone asks
What fatty acid is it based on?
It is based on ricinoleic acid, the main fatty acid found in castor oil.
Where is it commonly used?
It is often found in cushion sunscreens and tinted products where it helps emulsify and disperse pigments.