Ingredient review
Keratin Amino Acid Surfactant
INCI: SODIUM/TEA-LAUROYL KERATIN AMINO ACIDS
A gentle, protein-derived surfactant that cleanses without stripping, making it a good choice for sensitive skin or damaged hair.
In plain English
This ingredient is a mild soap-like molecule made by attaching lauric acid (from coconut or palm oil) to keratin amino acids (the building blocks of hair and skin proteins). It helps water mix with oil and dirt so they can be rinsed away, but it's much gentler than traditional sulfates. Because it's based on keratin, it can also leave hair feeling softer and less frizzy.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
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
Quick decision guide
Useful, but context matters
Keratin Amino Acid Surfactant 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Keratin Amino Acid Surfactant.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere 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) with keratin amino acids. The result is a molecule that has both water-loving and oil-loving parts, allowing it to lift dirt and excess oil from skin and hair.
How it works
When you lather a product containing this ingredient, its molecules surround oil droplets and dirt, forming tiny clusters called micelles. These micelles are easily rinsed away with water, carrying the impurities with them. Unlike harsher surfactants, it doesn't strip away too many natural oils or proteins, so skin and hair retain more moisture.
Pros
Mild on skin and hair
Because it's derived from keratin amino acids, this surfactant cleanses without stripping natural oils, making it ideal for daily use on sensitive or dry skin and fragile hair.
Protein conditioning effect
The keratin amino acid portion can deposit a thin protein layer on hair, helping to smooth the cuticle and reduce frizz, which is a bonus over plain surfactants.
Cons and cautions
Lower foam volume
Compared to sulfates like sodium lauryl sulfate, this ingredient produces a less rich, creamy lather, which some users may perceive as less effective even though it cleans well.
Potential sustainability issues
Lauric acid is often sourced from palm or coconut oil; if not certified sustainable, palm oil production can contribute to deforestation and habitat loss.
Best for
- People with dry or sensitive skin looking for a gentle cleanser
- Those with damaged or chemically treated hair who want to avoid harsh sulfates
Use caution if
- Individuals with a known allergy to keratin or coconut-derived ingredients (rare)
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and sensitization potential. Rare allergic reactions possible in individuals sensitive to keratin or coconut derivatives.
Research notes
Studies on similar amino acid-based surfactants show they are significantly milder to skin and eyes than sodium lauryl sulfate. Keratin-based variants may offer additional hair conditioning benefits, though direct clinical trials are limited.
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
- Shampoos, Body washes, Facial cleansers, Hair conditioners
- Environmental note
- Biodegradable and generally considered environmentally friendlier than sulfate-based cleansers, though the sourcing of lauric acid (palm or coconut) should be checked for sustainability certifications.
Good to know
- This ingredient is often found in 'keratin' or 'protein' shampoos marketed for hair repair.
- It is considered biodegradable and less harmful to aquatic life than some traditional surfactants.
- The 'TEA' in the name refers to triethanolamine, used to adjust pH and improve solubility.
Common questions
What is Keratin Amino Acid Surfactant in beauty products?
This ingredient is a mild soap-like molecule made by attaching lauric acid (from coconut or palm oil) to keratin amino acids (the building blocks of hair and skin proteins). It helps water mix with oil and dirt so they can be rinsed away, but it's much gentler than traditional sulfates. Because it's based on keratin, it can also leave hair feeling softer and less frizzy.
What does Keratin Amino Acid Surfactant do in a beauty product?
When you lather a product containing this ingredient, its molecules surround oil droplets and dirt, forming tiny clusters called micelles. These micelles are easily rinsed away with water, carrying the impurities with them. Unlike harsher surfactants, it doesn't strip away too many natural oils or proteins, so skin and hair retain more moisture.
Is Keratin Amino Acid Surfactant safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and sensitization potential. Rare allergic reactions possible in individuals sensitive to keratin or coconut derivatives.
Who should be careful with Keratin Amino Acid Surfactant?
Individuals with a known allergy to keratin or coconut-derived ingredients (rare)
Research sources
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.