Castor Isostearate Succinate



Castor Isostearate Succinate at a glance

  • A mix of esters formed by the reaction of castor seed oil, isostearic acid, and succinic acid
  • Functions as a skin conditioning agent
  • According to one supplier, it can also boost SPF in skin care
  • Deemed safe as used in cosmetics

Castor Isostearate Succinate description

Castor isostearate succinate is a mix of esters formed by the reaction of castor seed oil, isostearic acid, and succinic acid. This ingredient functions as a skin conditioning agent and is primarily used as an emollient or lubricant in hair or lip care products. According to one of its suppliers, it can also help boost SPF in skin care products. In its raw form, castor isostearate succinate is a clear to slightly hazy amber liquid. The independent Cosmetic Ingredient review board has ruled it safe as used in cosmetics. Typical usage levels range from 0.25%–10%, depending on desired formulary characteristics.

Castor Isostearate Succinate references

  • International Journal of Toxicology, August 2014
  • Surfactants in Personal Care Products and Decorative Cosmetics, 3rd Edition, CRC Press, Taylor & Francis Group, LLC 2007, page 374

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

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