Common Name(s): Methyl stearate,methanol stearic acid (c18) ester

DESCRIPTION

What It Does: Softens and conditions skin with a light, non-greasy feel.

Why It's Used: Used for its solid waxy methyl ester; lower melting point than stearic acid itself; mild consistency modifier emollient properties; suitable for lightweight skin care where non-greasy texture is key.

How It Works: Ester of methanol (branched or specialty alcohol) with stearic acid (c18); branching reduces crystallinity and greasiness; provides smooth, dry-oil skin feel.

Typically Found In: Lightweight moisturizers,sunscreens,skin serums,body lotions

TECHNICAL DETAILS

Primary Category: Functional ingredient – emollient

Secondary Functions: Skin conditioning,texture modification,spreading agent

Application Areas:

Typical Concentration Range: 0.5%–10%

SOURCING & ETHICS

Vegan Status: Conditional - feedstock declaration required

Halal Status: Unverified - feedstock declaration required (plant, animal and petrochemical routes all exist)

Source Notes: Methanol and stearic acid (c18); plant or synthetic origin. [audit 2026-07-29 rev2: origin-dependent: the same inci exists in plant, animal and petrochemical versions and the name does not discriminate. determination requires shariah-panel sign-off.]

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 1/5 – low

Sensitivity Concerns: Generally well tolerated.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Good safety profile. ewg score: 1.

Works Well With: Other emollients,silicones,natural oils,humectants

Avoid Combining With: No significant incompatibilities

SCIENTIFIC NOTE

Methyl stearate: methanol + c18 stearic; solid at room temperature with lower mp than free stearic acid; used as a mild consistency modifier and waxy emollient in anhydrous formulas.

Last Verified: 2026-03-28

Primary Sources: Cosing database,inci dictionary