Is Ascorbyl Isostearate safe in cosmetics?
Ascorbyl Isostearate has a safety rating of "MODERATE" in our database. EU status: permitted. US status: permitted.
Moderate
Cosmetic Ingredient
Ascorbyl Isostearate
Also known as: (2R)-2-[(1S)-1,2-Dihydroxyethyl]-4-hydroxy-5-oxo-2,5-dihydro-3-furanyl stearate, Ascorbic acid stearate, Ascorbyl stearate, Ascorbylmonostearate
INCI: ASCORBYL ISOSTEARATE
Ascorbyl Isostearate (CAS 51222-59-4) is a cosmetic cosmetic ingredient functioning as Skin-Conditioning Agent – Miscellaneous. EU Regulation 1223/2009 status: permitted. Industrial safety data is also available in the chemical safety database.
View industrial chemical safety profile for CAS 51222-59-4 →
Auto-generated CPSR Part A draft with source citations
Function
Skin-Conditioning Agent – Miscellaneous
Safety Rating
MODERATE
Regulatory Status
EU EU Status
permitted
US US Status
permitted
US Notes
CIR-reviewed (2022): safe as used when formulated to be nonirritating/nonsensitizing; however, not reported as being used in any cosmetic products at the time of the review
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for Ascorbyl Isostearate.
Calculate MoS for your specific formulation with the MoS Calculator.
Function Categories & List Membership
Cosmetic/Chemical Function Categories
Antioxidant
Expert Verdict
Expert safety assessment and concern-level summary for Ascorbyl Isostearate.
Known Synonyms
(2R)-2-[(1S)-1,2-Dihydroxyethyl]-4-hydroxy-5-oxo-2,5-dihydro-3-furanyl stearate
Ascorbic acid stearate
Ascorbyl stearate
Ascorbylmonostearate
Chemical Function
Antioxidant
Regulatory Lists
animal_products
Frequently Asked Questions
Is Ascorbyl Isostearate allowed in the EU?
Ascorbyl Isostearate EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.
What does Ascorbyl Isostearate do in cosmetics?
Ascorbyl Isostearate functions as: Skin-Conditioning Agent – Miscellaneous. It is classified as a cosmetic ingredient in our database. CAS number: 51222-59-4.
Compliance Tools
Check Ascorbyl Isostearate compliance across multiple jurisdictions:
Ingredient Decoder
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Substance Compliance
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MoS Calculator
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Heavy Metal Limits
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