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InventoryRef 3534615/10/2010

METHYLSILANOL ASCORBATE

L-Ascorbic acid, 6-O-(dihydroxymethylsilyl)

METHYLSILANOL ASCORBATE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 187991-39-5
CAS 187991-39-5PubChem CID 71587606

Methylsilanol ascorbate

IUPAC name
(2R)-2-[(1S)-2-[dihydroxy(methyl)silyl]oxy-1-hydroxyethyl]-3,4-dihydroxy-2H-furan-5-one
Molecular formula
C7H12O8Si
Molecular weight
252.25 g/mol
Exact mass
252.03014387 Da
Topological polar surface area
137.0 Ų
Hydrogen-bond donors
5
Hydrogen-bond acceptors
8
Covalent units
1
Defined stereocentres
2

Also known as

UNII-46Z5D1I0IS46Z5D1I0ISL-Ascorbic acid, 6-O-(dihydroxymethylsilyl)-RefChem:158312METHYLSILANOL ASCORBATE [INCI](5R)-5-[(1S)-2-{[Dihydroxy(methyl)silyl]oxy}-1-hydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for METHYLSILANOL ASCORBATE

INCI name

METHYLSILANOL ASCORBATE

Description

L-Ascorbic acid, 6-O-(dihydroxymethylsilyl)

Record provenance

Inventory reference
35346
Imported identity
METHYLSILANOL ASCORBATE
Source update
15/10/2010
European Commission CosIng source notes
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Key data

CAS
187991-39-5
EC
—
Restriction
—
Function
ANTIOXIDANT
Inhibiting reactions promoted by oxygen, thus avoiding oxidation and rancidity.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#16661 · METHYLSILANOL ASCORBATE

Ingredients with overlapping formulation functions

METHYL POLYSILSESQUIOXANE FERULATE HYALURONATEANTIOXIDANT; SKIN CONDITIONING - HUMECTANT
METHYLENE DI-T-BUTYLCRESOLANTIOXIDANT
METHYLENEDIOXYPHENYL DIHYDROXYBENZAMIDEANTIOXIDANT, BLEACHING, SKIN PROTECTING
METHYLSELENO CARBOXYETHYLGLUTAMINEANTI-SEBORRHEIC, ANTIMICROBIAL, ANTIOXIDANT, HAIR CONDITIONING, SKIN CONDITIONING, SKIN PROTECTING
METHYLSULFONYLPIPERIDINYLAMINO DIOXOTHIOMORPHOLINOMETHYL PHENYLINDOLEANTIOXIDANT, REDUCING, SKIN PROTECTING
MEVALONOYL PENTAPEPTIDE-37ANTIOXIDANT, SKIN CONDITIONING, SKIN PROTECTING
MEVALONOYL PENTAPEPTIDE-39ANTIOXIDANT, HAIR CONDITIONING, SKIN PROTECTING
MEVALONOYL TETRAPEPTIDE-36ANTIOXIDANT, SKIN CONDITIONING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How METHYLSILANOL ASCORBATE appears in the CosIng inventory

The CosIng inventory lists METHYLSILANOL ASCORBATE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

METHYLSILANOL ASCORBATE is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

METHYLSILANOL ASCORBATE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, METHYLSILANOL ASCORBATE carries the following function designation(s):

CAS 187991-39-5 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.
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Source note for METHYLSILANOL ASCORBATE

This page reproduces the CosIng inventory entry for METHYLSILANOL ASCORBATE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research METHYLSILANOL ASCORBATE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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