Castor Isostearate Succinate
A castor-based emollient and film former. It softens skin and holds moisture. Well tolerated.
Evidence by route
Topical application
A functional emollient. Safe.
- CIR Cosmetic Ingredient Review safety assessment
How to read tiers A–F
- BLimited evidence. One RCT or several controlled studies with limitations
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
Castor Isostearate Succinate is an emollient and film-former based on modified castor oil. It softens skin, helps retain water, and gives a flexible, long-wearing finish, useful in lip products, makeup, and formulas that need to last. This is a functional ingredient, not an active. It works on texture and feel: it leaves the surface soft and forms a layer that improves product wear. It has no proven corrective effect on wrinkles or tone. It acts only at the skin surface, with no meaningful systemic absorption, so its use during pregnancy and breastfeeding is fine. Tolerance is good: low irritation potential and low allergy risk. Comedogenicity is moderate-to-low (2), worth noting on oily or acne-prone skin, especially in occlusive formulas. On normal sensitive skin it usually sits well.
Frequently asked questions
Is Castor Isostearate Succinate safe during pregnancy?
Castor Isostearate Succinate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Castor Isostearate Succinate for?
Castor Isostearate Succinate suits: normal, dry, combination, oily, sensitive.
What is Castor Isostearate Succinate and what does it do in cosmetics?
A castor-based emollient and film former.
Is Castor Isostearate Succinate comedogenic?
On the Fulton scale 2/5 – low comedogenicity. For acne-prone skin, a rating of 3 or higher suggests choosing an alternative.
What's the INCI name for Castor Isostearate Succinate?
The INCI name is Castor Isostearate Succinate.
See Castor Isostearate Succinate in a product composition right on the store page
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Similar role in the formula
Explore by category
Ingredients in the same category
Caviar Extract, Ceratonia Siliqua Fruit Extract, Cetearyl Alcohol, Cetearyl Ethylhexanoate, Glycine, Isostearyl Isostearate, Polyglyceryl-3 Distearate, Urea
Published: · updated: