Ingredient review

Sodium Lauroyl Hydrolyzed Silk

INCI: Sodium Lauroyl Hydrolyzed Silk

A mild, silk-based cleanser that cleans without stripping and leaves skin and hair feeling soft.

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In plain English

Sodium Lauroyl Hydrolyzed Silk is a gentle cleansing ingredient made by attaching a fatty acid (lauric acid, from coconut or palm oil) to silk protein. This creates a mild surfactant that helps remove dirt and oil without being harsh. It also deposits a thin layer of silk protein on skin or hair, which can improve softness and shine. Because it’s so gentle, it’s often used in products for sensitive skin or baby care.

Review score

Safety, usefulness, and evidence

4.3Good
4.3/ 5

Strong fit for many routines

The evidence base is useful, but some claims depend heavily on the formula.

Risk flags are low for most users, though the finished product can still irritate.

Source
semi synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Easy yes for most routines

Sodium Lauroyl Hydrolyzed Silk is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Sodium Lauroyl Hydrolyzed Silk.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A semi-synthetic surfactant created by chemically bonding lauric acid (a fatty acid from coconut or palm oil) with hydrolyzed silk protein. The result is a mild cleansing agent that also conditions.

How it works

In a cleanser, it reduces the surface tension of water, helping to lift and rinse away dirt, oil, and makeup. Unlike stronger surfactants (like sodium lauryl sulfate), it is less likely to strip the skin’s natural moisture barrier. The silk protein portion can adsorb onto skin and hair, leaving a smooth, soft feel.

Pros

Exceptionally mild

It cleans effectively without stripping the skin’s natural oils, making it ideal for daily use on sensitive or dry skin.

Adds softness

The silk protein component deposits a light conditioning film that leaves skin and hair feeling smooth and silky.

Cons and cautions

Limited cleansing power

It may not thoroughly remove heavy makeup, waterproof sunscreen, or excess oil, so a double-cleanse step might be needed.

Sustainability concerns

Lauric acid is often sourced from palm oil, which can be linked to deforestation unless certified sustainable.

Best for

  • People with dry, sensitive, or eczema-prone skin
  • Anyone looking for a sulfate-free, gentle cleanser
  • Those with fine or damaged hair who want a mild shampoo

Use caution if

  • People who need a deep-cleansing or clarifying shampoo for oily scalps may find it too gentle

Usage tips

Use in a gentle, sulfate-free cleanser for morning or second-step cleansing.
Pair with a stronger surfactant (like cocamidopropyl betaine) in shampoos to boost foam without increasing irritation.
Store products containing this ingredient in a cool, dry place to maintain stability.

Safety summary

Sodium Lauroyl Hydrolyzed Silk is considered safe for use in cosmetics. It has low irritation and sensitization potential, and no significant safety concerns have been reported in normal use. As with any ingredient, patch testing is recommended for those with known sensitivities.

Research notes

Research on this specific ingredient is limited, but it is well-characterized as a mild surfactant. Studies on similar acylated protein surfactants confirm low irritation and good conditioning properties. The Cosmetic Ingredient Review (CIR) has not issued a specific monograph, but related amino acid-based surfactants are generally recognized as safe.

Common label clues

Typical concentration
1–10% in rinse-off products
Regulatory status
Approved for use in cosmetics in the EU, US, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
Common uses
Facial cleansers, Shampoos, Body washes, Conditioners
Environmental note
The silk protein is a byproduct of silk production, and the lauric acid can be sourced from certified sustainable palm or coconut oil. Overall, it has a lower environmental impact than many petroleum-based surfactants.

Good to know

  • Sodium Lauroyl Hydrolyzed Silk is considered biodegradable and is often used in natural and organic formulations.
  • It is not a true protein but a modified protein that is more stable and effective as a cleanser.

Common questions

What is Sodium Lauroyl Hydrolyzed Silk in beauty products?

Sodium Lauroyl Hydrolyzed Silk is a gentle cleansing ingredient made by attaching a fatty acid (lauric acid, from coconut or palm oil) to silk protein. This creates a mild surfactant that helps remove dirt and oil without being harsh. It also deposits a thin layer of silk protein on skin or hair, which can improve softness and shine. Because it’s so gentle, it’s often used in products for sensitive skin or baby care.

What does Sodium Lauroyl Hydrolyzed Silk do in a beauty product?

In a cleanser, it reduces the surface tension of water, helping to lift and rinse away dirt, oil, and makeup. Unlike stronger surfactants (like sodium lauryl sulfate), it is less likely to strip the skin’s natural moisture barrier. The silk protein portion can adsorb onto skin and hair, leaving a smooth, soft feel.

Is Sodium Lauroyl Hydrolyzed Silk safe for most people?

Sodium Lauroyl Hydrolyzed Silk is considered safe for use in cosmetics. It has low irritation and sensitization potential, and no significant safety concerns have been reported in normal use. As with any ingredient, patch testing is recommended for those with known sensitivities.

Who should be careful with Sodium Lauroyl Hydrolyzed Silk?

People who need a deep-cleansing or clarifying shampoo for oily scalps may find it too gentle

Research sources

Cosmetic Ingredient Review – Safety of Amino Acid Alkyl AmidesOpenPubChem – Sodium Lauroyl Hydrolyzed SilkOpenEnvironmental Working Group – Ingredient SafetyOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.