Ingredient review

Potassium Undecylenoyl Hydrolyzed Collagen

INCI: POTASSIUM UNDECYLENOYL HYDROLYZED COLLAGEN

A mild, amino-acid-based surfactant that cleanses effectively while being gentle on the skin barrier.

beautyskincarecleanser

In plain English

This ingredient is a soap-like molecule made by joining a fatty acid from castor oil with collagen proteins. It works as a mild cleanser that lifts dirt and oil from your skin without stripping away its natural moisture. Unlike harsh soaps, it leaves skin feeling soft and comfortable.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Potassium Undecylenoyl Hydrolyzed Collagen 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 Potassium Undecylenoyl Hydrolyzed Collagen.
  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 reacting undecylenic acid (from castor oil) with hydrolyzed collagen (from animal or marine sources). The result is a gentle cleansing agent that belongs to the family of amino-acid surfactants.

How it works

Its molecular structure has a water-loving head and an oil-loving tail. When you wash, the tails grab onto dirt and excess oil while the heads stay in water, allowing everything to be rinsed away. Because it is derived from collagen, it is less irritating than traditional sulfate cleansers.

Pros

Mild on skin

This surfactant has a low irritation risk, making it ideal for daily use on sensitive or reactive skin.

Moisture-friendly

Unlike many cleansers, it does not disrupt the skin's natural moisture barrier, helping maintain hydration.

Cons and cautions

Not vegan-friendly

Because it is derived from animal collagen, it is not suitable for those following a vegan lifestyle.

Limited heavy-duty cleansing

It may struggle to remove long-wear or waterproof makeup, requiring a double-cleansing step.

Best for

  • People with dry or sensitive skin looking for a gentle cleanser
  • Anyone wanting to avoid harsh sulfates in their skincare routine

Use caution if

  • Strict vegans or those avoiding animal-derived ingredients

Usage tips

Use as a second cleanser in a double-cleansing routine for best results.
Pair with a moisturizer to lock in hydration after cleansing.

Safety summary

Considered safe for use in rinse-off cosmetics at typical concentrations. Low irritation and sensitization potential, with no significant safety concerns reported in cosmetic use.

Research notes

Amino-acid surfactants like this one are well-studied for mildness and skin compatibility. While specific studies on this exact ingredient are limited, the broader class is supported by dermatological research as gentle alternatives to sulfates.

Common label clues

Typical concentration
1–10% in rinse-off products
Regulatory status
Approved for use in cosmetics in the EU, US, and other major markets. No known restrictions at typical use levels.
Common uses
Facial cleansers, Body washes, Shampoos, Makeup removers
Environmental note
Derived from castor oil and collagen byproducts, it is biodegradable and has a lower environmental impact than many petroleum-based surfactants.

Good to know

  • Often listed as 'Potassium Undecylenoyl Hydrolyzed Collagen' on ingredient labels.
  • It is biodegradable and considered environmentally friendly compared to some synthetic surfactants.

Common questions

What is Potassium Undecylenoyl Hydrolyzed Collagen in beauty products?

This ingredient is a soap-like molecule made by joining a fatty acid from castor oil with collagen proteins. It works as a mild cleanser that lifts dirt and oil from your skin without stripping away its natural moisture. Unlike harsh soaps, it leaves skin feeling soft and comfortable.

What does Potassium Undecylenoyl Hydrolyzed Collagen do in a beauty product?

Its molecular structure has a water-loving head and an oil-loving tail. When you wash, the tails grab onto dirt and excess oil while the heads stay in water, allowing everything to be rinsed away. Because it is derived from collagen, it is less irritating than traditional sulfate cleansers.

Is Potassium Undecylenoyl Hydrolyzed Collagen safe for most people?

Considered safe for use in rinse-off cosmetics at typical concentrations. Low irritation and sensitization potential, with no significant safety concerns reported in cosmetic use.

Who should be careful with Potassium Undecylenoyl Hydrolyzed Collagen?

Strict vegans or those avoiding animal-derived ingredients

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Amino Acid SurfactantsOpenPubMed - Mild Surfactants for Skin CleansingOpenINCI Database - Potassium Undecylenoyl Hydrolyzed CollagenOpen

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.