Sodium Lauroyl Silk Amino Acids

What is Sodium Lauroyl Silk Amino Acids?

Sodium Lauroyl Silk Amino Acids is an anionic surfactant produced by acylating amino acids derived from hydrolyzed silk fibroin—a natural protein from silkworm cocoons—with lauroic acid, then neutralizing with sodium. Silk fibroin yields small peptides rich in glycine, alanine, and serine, mimicking human skin and hair proteins. Primarily used in rinse-off cosmetics like shampoos, conditioners, facial cleansers, and body washes, it functions by lowering surface tension to create foam and micelles that lift dirt and oils without stripping natural moisture. Its amino acid structure also deposits on skin and hair, enhancing softness and reducing friction, while providing antistatic effects to tame flyaways.

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:

Hair conditioning
Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
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.
Antistatic agent
Reduces static electricity and flyaways by improving surface conductivity, enhancing hair manageability and smoothness in conditioners and styling products.

Benefits

Provides gentle cleansing that removes impurities while preserving skin's moisture barrier.

Conditions hair and skin for improved softness, smoothness, and manageability.

Acts as an antistatic agent to reduce static and enhance product spreadability.

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 with sensitive skin seeking mild surfactants in cleansers.
Anyone with known allergies to silk proteins or silk-derived ingredients.
Individuals with dry or damaged hair needing conditioning in shampoos.
People sensitive to lauroyl-based surfactants, though rare.
Those preferring protein-derived ingredients for natural feel in rinse-off products.
Those avoiding animal-derived components in cosmetics.

Safety Notes

  • Rated low hazard by independent safety assessments.
  • Suitable for typical cosmetic use concentrations in rinse-off products.

Frequently Asked Questions about Sodium Lauroyl Silk Amino Acids

What is Sodium Lauroyl Silk Amino Acids made from?

It comes from amino acids of hydrolyzed silk fibroin, modified with lauroic acid and sodium for surfactant properties.

Is it suitable for sensitive skin?

Yes, its mild profile makes it appropriate for sensitive skin in rinse-off cleansers.

Does it help with hair static?

Yes, it reduces static electricity, improving hair manageability in conditioners.