Linseed Acid
AKA “Octadeca-9, 15-trienoic acid, 15-Octadecatrienoic acid, RefChem:799239, ?-Linolenic acid-d5, |A-Lnn, CBiol_001952, KBioGR_000096”
Acid
Ingredient Facts
Linseed acid
AKA: Octadeca-9, 15-trienoic acid, 15-Octadecatrienoic acid, RefChem:799239, ?-Linolenic acid-d5, |A-Lnn, CBiol_001952, KBioGR_000096
Acid · Emollient · EWG: 4
Plant-Derived
Emollient
Cleanser
Emulsifier
Skin Conditioner
Acid
Clean
Derived from flax seeds, this natural cleanser gently removes impurities while conditioning and softening skin. It helps blend oil and water-based ingredients for a smooth, unified formula.
Effective at 37.0%
Family
Linaceae (Flax family)
Plant Part
Seed
Formula
C18H30O2
Mol. Weight
278.40
CAS #
68424-45-3
Form
Liquid
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Locks In Moisture
Traditional Use
Linseed (flax) oil has been used for thousands of years in skin and hair care across Asian and European cultures. Linseed acid refers to the fatty acid components traditionally valued for their emollient and anti-inflammatory properties.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
3e-05%
74.0%
0%100%
Effective Range
CIR reported use: 0.004-2 | 0.003-0.4 | 0.00003-0.2 | 0.002-74 | 0.001-10
Regulatory Agencies
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR