PROTEIN
Laurdimonium Hydroxypropyl Hydrolyzed Keratin
- protein
A keratin given a positive charge so it deposits where hair is damaged, conditioning and firming in one ingredient.
- products in our library
- 27
- of researched products
- 0.7%
- on the label, in our conditioners
- usually #12
- most common in
- Conditioner
- in water
- Water-soluble
At a glance
Four named levels, read from this ingredient’s chemical class, its charge, its solubility, or where it sits on the labels we have. More dots means more of the property named — never “better”.
How much of it is left on hair between washes.
What it takes to get it off the hair again.
Smaller fragments travel further into the strand.
Read from where it sits on the labels we have, not from the molecule.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Low | 1 of 5 |
| Rinse-out behaviour | Stays where hair is damaged | 2 of 5 |
| Fragment size | Small | 2 of 5 |
| Stiffening potential | Slight | 2 of 5 |
What it does for a formula
What Laurdimonium Hydroxypropyl Hydrolyzed Keratin does
The general function first, then how the role changes by product type where we have researched it.
Sticks to damaged areas of the surface and temporarily firms them.
Welcome on limp or damaged hair, unwelcome on hair that already feels rigid.
Fragments small enough to attach to worn areas of the strand — the protein that works.
Positive charge is drawn to the negatively charged, worn patches of a strand.
Charge
Positively charged, so it is drawn to the negatively charged, damaged areas of hair and stays behind after rinsing. That is why conditioning happens where the wear is.
Solubility
Rinses out with water alone — it does not accumulate on hair between washes.
Where it appears
Where it appears
One row per product category in our library: how many products list it, what share of that category that is, and where it typically sits on the label.
| Product type | How common | Typical position on label ? |
|---|---|---|
Conditioner
10 products
|
secondary · #12 | |
Shampoo
7 products
|
secondary · #11 | |
Mask / treatment
6 products
|
secondary · #14 | |
Finisher: oil
1 product
|
supporting · #6 | |
Leave-in
1 product
|
secondary · #20 | |
Styler: mousse
1 product
|
secondary · #13 | |
Styler: volumizer
1 product
|
supporting · #8 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Conditioner | 10 | 1% | 12 | 7 | secondary |
| Shampoo | 7 | 1% | 11 | 7 | secondary |
| Mask / treatment | 6 | 2% | 14 | 9 | secondary |
| Finisher: oil | 1 | 1% | 6 | 6 | supporting |
| Leave-in | 1 | 0% | 20 | 20 | secondary |
| Styler: mousse | 1 | 1% | 13 | 13 | secondary |
| Styler: volumizer | 1 | 2% | 8 | 8 | supporting |
No product-type differences have been researched yet — the reading below is computed from where it sits on the labels in our library.
Position footprint
Every listing in our library, by position on the label.
| Positions | Zone | Listings |
|---|---|---|
| 1-3 | Leading | 0 |
| 4-8 | Supporting | 5 |
| 9-15 | Secondary | 15 |
| 16-25 | Lower | 5 |
| 26+ | Trace | 4 |
How to read this
US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order.
So position tells you about relative amount only above that line, and we never convert a position into a percentage.
Who should pay attention
Conditional formulation guidance, scoped to a hair condition and to the positions where it is meaningful. It is not a conclusion about any finished product, and not a conclusion about you.
A cationic conditioning agent: it binds to the damaged, negatively charged parts of the cuticle and lowers combing friction there.
Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
Hydrolysed fragments are small enough to sit in the gaps of a worn cuticle for a wash or two, temporarily restoring stiffness and cutting breakage in combing.
Substantive by design. A routine with no detergent wash gives it nothing to leave with.
How rigid the finish is depends on which polymer it is and what the formula pairs with it, not on there being one.
Detangling and weight come from the same deposit; how much of each depends on the chain length of the specific conditioner.
Read where it is listed in the first three ingredients or positions 4–8.Hair that reliably stiffens after protein reacts to a prominent hydrolysed protein first; near the top of a list is where it is most likely to be felt.
Read where it is listed in the first three ingredients or positions 4–8.Read from this ingredient’s chemical class. Where we have researched the ingredient itself, that reading replaces the class one.
Why it matters to shoppers
What this ingredient is evidence of, what it is not evidence of, and what our own method can and cannot tell you.
- temporary strength on damaged hair
- detangling
- thick or coarse hair
- a protein that binds to damaged hair
- an exact safety score — we do not publish one, for any ingredient
- how a finished product performs by itself — that is the whole formula, not one line of it
- the exact percentage in a bottle — label position never converts into a number
- a secondary protein, listed below the main ingredients in our conditioners
- it was on the label of every product we counted — we read printed ingredient lists, not marketing copy
- it is meant to stay on the hair rather than rinse away
- that it repairs hair permanently
- stiffness — only how much of it there is does that
- that a product is right or wrong for you
We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
Commonly paired with
Ingredients that appear alongside this one most often in our library. Near-universal ingredients are excluded — they pair with everything and tell you nothing.
- Rosa Canina Fruit Oil · 22
- Arginine Hcl · 21
- Phosphatidylcholine · 20
- Sodium Hydroxide · 19
- Guar Hydroxypropyltrimonium Chloride · 17
- Stearyl Alcohol · 15
- Isopropyl Alcohol · 15
- Behentrimonium Chloride · 15
- Propylene Glycol · 14
- Cocos Nucifera (Coconut) Oil · 13
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to soften the strand, firm up damaged areas, and clean and build foam.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
Joico · Finisher
Blonde Life Brilliant Glow Brightening Oil
#6 on the label · $8.38/oz
Joico · Shampoo
Color Balance Blue Shampoo
#7 on the label · $3.19/oz
Joico · Conditioner
Color Balance Purple Conditioner
#7 on the label · $1.99/oz
Joico · Shampoo
Color Balance Purple Shampoo
#7 on the label · $1.30/oz
Joico · Styler
JoiFULL Volumizing Styler for Plush, Long-Lasting Fullness & Lift
#8 on the label · $7.79/oz
Joico · Conditioner
Colorful Anti-Fade Conditioner
#9 on the label · $2.82/oz
Joico · Finisher
K-PAK Color Therapy Luster Lock Glossing Oil
#9 on the label · $11.46/oz
Joico · Mask / treatment
K-PAK Deep-Penetrating Reconstructor
#9 on the label · $2.56/oz
Joico · Conditioner
K-PAK Reconstructing Conditioner
#10 on the label · $2.88/oz
Joico · Shampoo
K-PAK Daily Reconstructing Shampoo
#11 on the label · $2.43/oz
Joico · Conditioner
Moisture Recovery Conditioner
#11 on the label · $2.88/oz
Joico · Shampoo
Moisture Recovery Moisturizing Shampoo
#11 on the label · $2.06/oz
See all 27 products in the library that list Laurdimonium Hydroxypropyl Hydrolyzed Keratin
Identity
What this entry is, and what our references call it.
No public-domain structure depiction is available for this entry.
Laurdimonium Hydroxypropyl Hydrolyzed Keratin
- conditioning agent
- film former
- hydrolysed protein
- laurdimonium hydroxypropyl hydrolyzed keratin
For your hair?
Whether Laurdimonium Hydroxypropyl Hydrolyzed Keratin matters for your hair depends on your hair.
27 products in our library list itWhat this ingredient does, and where it sits on the labels we have researched.
A verdict on any product that contains it, and never a safety grade.
We do not physically test your hair. Everything above is read from the ingredient lists in our library and from published references — the consultation is what turns it into a plan.
References
Seed entry — sourcing in progress Written from our reference work; primary sourcing is still being attached.
No published source is attached to this entry yet.
How this page was made
- Every number above is counted from the ingredient lists in our own product library — 27 of 3889 researched products list this ingredient. Nothing on this page is written per ingredient.
- The dots are named levels read from an ingredient’s chemical class, charge, solubility, or where it sits on the labels we have — never a score.
- US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Position tells you about relative amount only above that line, and we never convert a position into a percentage.
- The prominence bands (leading, supporting, secondary) are the same ones the product pages use to read a single label, applied here to the median position across a category.
- We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
- Identifiers and references appear only when a published source is attached to this entry; where none is, the row is simply absent rather than filled in.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Entry last updated 2026-09-02. Product-page methodology: the product library.