Linum Usitatissimum (Flax) Acid

What is Linum Usitatissimum (Flax) Acid?

Linum Usitatissimum (Flax) Acid originates from the seeds of the flax plant (Linum usitatissimum), a herbaceous annual rich in polyunsaturated fatty acids like alpha-linolenic acid. This ingredient is extracted and processed into a form suitable for cosmetics, primarily used in cleansing products, shampoos, and emulsions. It works by reducing surface tension to facilitate dirt and oil removal through micelle formation, stabilizes oil-in-water mixtures by creating interfacial films, and provides a softening effect on skin by mimicking natural lipids. Commonly found in gentle facial washes, body cleansers, and lightweight moisturizers, it supports product texture and mild performance without harsh chemical surfactants.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Surfactant

Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.

Cleansing agent

Removes dirt, oil, and impurities by lowering surface tension and forming micelles, enabling soils to be lifted and rinsed away from skin, hair, or teeth.

Emollient

Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.

Emulsifying agent

Enables stable mixing of oil and water phases by forming an interfacial film, helping create lotions, creams, and cleansers with consistent texture.

Benefits

Enables effective yet gentle cleansing by lifting impurities and excess oils.

Softens skin texture and enhances product spreadability as an emollient.

Supports stable emulsions for consistent lotion and cleanser formulas.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit	Who Should Avoid
People preferring natural, plant-based cleansing ingredients.	Individuals with known flaxseed or seed allergies.
Those with normal to dry skin seeking mild surfactants.	People sensitive to unsaturated fatty acids.
Users of shampoos or washes wanting foaming without irritation.	Those preferring fully synthetic-free or minimal-ingredient products.

Safety Notes

Rated low concern by EWG with scores of 1 across functions.
Non-comedogenic with a rating of 0, suitable for acne-prone skin.

Frequently Asked Questions about Linum Usitatissimum (Flax) Acid

What is Linum Usitatissimum (Flax) Acid?

A fatty acid derived from flaxseeds, used as a surfactant and emollient in mild cleansers and lotions.

Is it safe for daily use?

Yes, it has a low EWG rating of 1 and is non-comedogenic, suitable for regular cleansing.

Does it cause irritation?

Evidence suggests low irritation potential, ideal for sensitive skin routines.