Common Name(s): Isostearyl lactate,isostearyl alcohol (branched c18) lactic acid (l-lactate ester) ester
DESCRIPTION
What It Does: Softens and conditions skin with a light, non-greasy feel.
Why It's Used: Used for its liquid branched ester with mild aha-affinity lactic acid; non-greasy; skin-compatible emollient properties; suitable for lightweight skin care where non-greasy texture is key.
How It Works: Ester of isostearyl alcohol (branched c18) (branched or specialty alcohol) with lactic acid (l-lactate ester); 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 โ emollient
Secondary Functions: Skin conditioning,texture modification,spreading agent
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.5%โ10%
SOURCING & ETHICS
Vegan Status: Conditional - feedstock declaration required
Halal Status: Unverified - feedstock declaration required (plant, animal and petrochemical routes all exist)
Source Notes: Isostearyl alcohol (branched c18) and lactic acid (l-lactate ester); 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 โ very low
Comedogenicity Rating: 1/5 โ 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
Isostearyl lactate: branched c18 isostearyl alcohol + lactic acid; liquid emollient with mild aha-character from lactic acid; non-greasy, skin-compatible; used in exfoliating and skin conditioning formulas.
Last Verified: 2026-03-28
Primary Sources: Cosing database,inci dictionary