PROTEIN
Hydrolyzed Protein
- protein
A protein broken into fragments small enough to cling to the hair. It fills gaps on damaged strands and firms the feel for a few washes; too much reads as stiff.
- products in our library
- 3
- of researched products
- 0%
- on the label, in our end oils
- usually #5
- most common in
- Finisher: end oil
- in water
- Water-soluble
At a glance
Four things worth knowing about how this ingredient behaves on hair.
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 | Rinses clean | 5 of 5 |
| Fragment size | Small | 2 of 5 |
| Stiffening potential | Moderate | 3 of 5 |
What it does for a formula
What Hydrolyzed Protein 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 that attach to worn areas of the strand, where protein does its work.
The film is what holds a shape once the water has gone.
Charge
Charge is not recorded for this ingredient.
Solubility
Rinses out with water alone, so it does not build up 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 ? |
|---|---|---|
Finisher: end oil
1 product
|
supporting · #5 | |
Mask / treatment
1 product
|
secondary · #16 | |
Shampoo
1 product
|
secondary · #11 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Finisher: end oil | 1 | 13% | 5 | 5 | supporting |
| Mask / treatment | 1 | 0% | 16 | 16 | secondary |
| Shampoo | 1 | 0% | 11 | 11 | secondary |
We have not researched differences by product type yet. The reading below comes 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 | 1 |
| 9-15 | Secondary | 1 |
| 16-25 | Lower | 1 |
| 26+ | Trace | 0 |
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.
Why it matters to shoppers
What seeing this ingredient tells you, what it does not, and the limits of our own method.
- temporary strength on damaged hair
- a protein that binds to damaged hair
- a style that holds
- a rinse-clean feel
- an exact safety score (we do not publish one for any ingredient)
- how a finished product performs, which depends on the whole formula, not one line of it
- the exact percentage in a bottle, because label position never converts into a number
- a supporting protein alongside the main ingredients in our end oils
- it was on the printed ingredient list of every product we counted (we read labels, not marketing copy)
- that it repairs hair permanently
- stiffness (that depends on how much of it there is)
- 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
The ingredients that most often appear alongside this one in our library. We leave out the near-universal ones, because they pair with everything and tell you nothing.
- Cyclopentasiloxane · 2
- Methylisothiazolinone · 2
- Ammonium Chloride · 1
- Cocoamidopropyl Betaine · 1
- Green 3 (Ci 42053) · 1
- Steartrimonium Chloride · 1
- Lauryl Glucoside · 1
- Mangifera Indica (Mango) Seed Butter · 1
- Hydrolyzed Keratin · 1
- Sodium Laureth Sulfate · 1
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to smooth the surface, keep the formula stable, 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.
Identity
What this entry is, and what our references call it.
No public-domain structure depiction is available for this entry.
Hydrolyzed Protein
- film former
- hydrolysed protein
- hydrolyzed protein
For your hair?
Whether Hydrolyzed Protein matters for your hair depends on your hair.
3 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 comes 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: 3 of 6816 researched products list this ingredient. Nothing on this page is written per ingredient.
- The dots are levels, not scores. Each one comes from what kind of ingredient it is (its chemical class, charge and solubility) or from where it sits on the labels we have.
- 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. Without one, we leave the row out rather than fill it in.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Entry last updated 2026-09-22. Product-page methodology: the product library.
