Hydrogenated Castor Oil/Sebacic Acid Copolymer



No known benefits

Hydrogenated Castor Oil/Sebacic Acid Copolymer at a glance

  • Is both synthetic and plant-derived
  • Chemically, it’s an oligo ester, or short polymer
  • Used in hair care products to smooth the cuticle layer
  • Excellent cling to skin and hair helps prevent moisture loss

Hydrogenated Castor Oil/Sebacic Acid Copolymer description

Hydrogenated castor oil/sebacic acid copolymer is made by a chemical reaction between hydrogenated (semi-solid) castor oil with sebacic acid, a carboxylic acid sometimes used as a pH adjuster in skin care products. The resulting ingredient has long-lasting emollient and smoothing properties that benefit skin and hair. The unique structural properties of this ingredient allow it to fill in the spaces where skin and hair are damaged, creating a perceptibly smoother feel. It’s an example of polymer technology that combines a natural and synthetic ingredient to create a new compound. Hydrogenated castor oil/sebacic acid copolymer is used in amounts between 0.5-2% in leave-on products and up to 5% in rinse-off hair care products designed for intensive repair. The safety of hydrogenated castor oil has been established and while an individual safety assessment of sebacic acid hasn’t been done, it is not believed to be a problem as used in cosmetics.

Hydrogenated Castor Oil/Sebacic Acid Copolymer references

  • International Journal of Toxicology, Supplement 3, May 2007, pages 31-77

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not Rated