What it is
Sebacic Acid is a ten-carbon dicarboxylic acid produced industrially from castor oil. In formulations it serves as a raw material for emollient esters and biodegradable polymers and can also act as a buffering or chelating component. In sunscreens it is typically a minor structural or conditioning ingredient rather than a UV filter.
Safety & warnings
Sebacic acid is widely used in cosmetics and is generally well tolerated at the levels employed. It is not considered a notable sensitizer or comedogen in typical formulations.
Origin & sourcing
Largely bio-based; it is commercially manufactured from ricinoleic acid obtained from castor oil through alkaline cleavage.
Questions everyone asks
What is sebacic acid made from?
It is most often produced from castor oil, making it a largely bio-based dicarboxylic acid.
What role does it play in a sunscreen?
It functions as a conditioning or structural building block and as a buffering or chelating component, not as a UV filter.