Ingredient review

Potassium Behenoyl Hydroxyproline

INCI: POTASSIUM BEHENOYL HYDROXYPROLINE

A mild, amino-acid-based cleansing agent that cleans without stripping the skin's natural moisture barrier.

beautyskincaresurfactant

In plain English

Potassium Behenoyl Hydroxyproline is a gentle cleanser made from behenic acid (a fatty acid found in oils like rapeseed) and hydroxyproline (an amino acid that's part of collagen). It helps remove dirt and oil from your skin without being harsh or drying, making it a popular choice for sensitive skin. Think of it as a soft sponge that cleans thoroughly but leaves your skin's protective layer intact.

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

Potassium Behenoyl Hydroxyproline 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 Potassium Behenoyl Hydroxyproline.
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

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 combining behenic acid (a long-chain fatty acid) with hydroxyproline (an amino acid naturally found in collagen). The result is a mild cleansing agent that forms a gentle lather.

How it works

In a cleanser, this ingredient helps water mix with oil and dirt on your skin, allowing them to be rinsed away. Its amino-acid structure makes it less disruptive to the skin's natural barrier compared to traditional sulfate-based cleansers, so it cleans effectively without causing tightness or irritation.

Pros

Ultra-gentle on skin

Because it's derived from amino acids, this surfactant cleans without disrupting the skin's moisture barrier, reducing the risk of dryness or irritation after washing.

Supports barrier health

The hydroxyproline component may help support collagen structure, so this cleanser not only cleans but also leaves skin feeling conditioned and comfortable.

Cons and cautions

Less effective on heavy makeup

Its mild nature means it may struggle to fully remove waterproof mascara or long-wear foundation, often requiring a double-cleansing step.

Higher cost

Amino-acid surfactants are more expensive to produce than traditional sulfates, so products containing them tend to cost more.

Best for

People with sensitive, dry, or easily irritated skin
Those looking for a sulfate-free cleanser that still lathers

Use caution if

Individuals who prefer a very high-foaming, squeaky-clean feel (this is milder and less foamy)

Usage tips

Use as a second cleanser in a double-cleansing routine for best results on makeup days.

Lather in your hands with a little water before applying to damp skin to activate the gentle foam.

Safety summary

Potassium Behenoyl Hydroxyproline is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for sensitive skin. No significant safety concerns have been reported in regulatory reviews.

Research notes

Amino-acid-based surfactants like this one are well-studied for their mildness and compatibility with skin. While specific studies on Potassium Behenoyl Hydroxyproline are limited, the broader class of acyl amino acid surfactants is supported by dermatological research showing reduced irritation compared to sulfates.

Common label clues

Typical concentration: 0.5% to 5% in rinse-off products
Regulatory status: Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
Common uses: Cleansers, Facial washes, Shampoos, Body washes
Environmental note: Derived from plant-based fatty acids and amino acids, it is generally considered biodegradable and less harmful to aquatic life compared to some synthetic surfactants.

Good to know

This ingredient is often found in 'low pH' cleansers that match the skin's natural acidity (around pH 5.5).
It is biodegradable and considered more environmentally friendly than some traditional surfactants.

Common questions

What is Potassium Behenoyl Hydroxyproline in beauty products?

What does Potassium Behenoyl Hydroxyproline do in a beauty product?

Is Potassium Behenoyl Hydroxyproline safe for most people?

Who should be careful with Potassium Behenoyl Hydroxyproline?

Individuals who prefer a very high-foaming, squeaky-clean feel (this is milder and less foamy)

Research sources

CosIng - European Commission DatabaseOpen PubMed - Amino Acid Surfactants ReviewOpen Environmental Working Group (EWG) - 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.