FILM FORMER
Polyglutamic Acid
- film former
A fermented amino-acid polymer that holds several times its weight in water and leaves a light film.
- products in our library
- 6
- of researched products
- 0.2%
- on the label, in our masks and treatments
- usually #31
- most common in
- Mask / treatment
- 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.
What the polymer class can do, not what any bottle claims.
How well the film survives damp air, as a class.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Low | 1 of 5 |
| Rinse-out behaviour | Rinses clean | 5 of 5 |
| Hold | Not recorded | not recorded |
| Humidity resistance | Not recorded | not recorded |
What it does for a formula
What Polyglutamic Acid does
The general function first, then how the role changes by product type where we have researched it.
The film is what holds a shape once the water has gone.
How firmly depends on the polymer class and how much of it is used.
Binds water and holds it against the hair rather than adding oil.
What a humectant does depends on the air around it as much as on the formula.
Charge
Charge is not recorded for this ingredient.
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 ? |
|---|---|---|
Mask / treatment
2 products
|
secondary · #31 | |
Conditioner
1 product
|
secondary · #15 | |
Leave-in
1 product
|
secondary · #10 | |
Shampoo
1 product
|
secondary · #21 | |
Styler: mousse
1 product
|
supporting · #7 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Mask / treatment | 2 | 1% | 31 | 11 | secondary |
| Conditioner | 1 | 0% | 15 | 15 | secondary |
| Leave-in | 1 | 0% | 10 | 10 | secondary |
| Shampoo | 1 | 0% | 21 | 21 | secondary |
| Styler: mousse | 1 | 1% | 7 | 7 | 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 | 2 |
| 9-15 | Secondary | 3 |
| 16-25 | Lower | 1 |
| 26+ | Trace | 1 |
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.
Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.
Humectants bind water into the strand, and water — not oil — is what makes dry hair flexible instead of brittle.
A humectant follows the air: it holds water in humid conditions and can give it up in very dry ones. Climate decides what it does more than the label does.
How rigid the finish is depends on which polymer it is and what the formula pairs with it, not on there being one.
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.
- a style that holds
- hydration rather than oil
- a rinse-clean feel
- hold that does not drop
- 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 film former, listed below the main ingredients in our masks and treatments
- it was on the label of every product we counted — we read printed ingredient lists, not marketing copy
- 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.
- Leuconostoc/Radish Root Ferment Filtrate · 5
- Sodium Hyaluronate · 5
- Squalane · 4
- Hydroxycitronellal · 4
- Benzyl Benzoate · 4
- Cocos Nucifera (Coconut) Oil · 4
- Guar Hydroxypropyltrimonium Chloride · 4
- Behentrimonium Chloride · 4
- Curcuma Longa (Turmeric) Root Extract · 3
- Sesamum Indicum (Sesame) Seed Oil · 3
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to keep the formula stable, hold on to water, and improve feel after rinsing.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
IGK · Styler
Beach Club High-Shine Texture Foam
#7 on the label · $6.40/oz
IGK · Scalp treatment
Hair Density Scalp Treatment
#8 on the label · $21.43/oz
amika · Leave-in
Hydro Rush Intense Moisture Leave-In Conditioner
#10 on the label · $4.63/oz
amika · Mask / treatment
Hydro Rush Intense Moisture Mask
#11 on the label
amika · Conditioner
Hydro Rush Intense Moisture Conditioner
#15 on the label · $2.56/oz
amika · Shampoo
Hydro Rush Intense Moisture Shampoo
#21 on the label · $3.04/oz
Olaplex · Mask / treatment
Weightless Nourishing Mask
#51 on the label · $6.51/oz
Identity
What this entry is, and what our references call it.
No public-domain structure depiction is available for this entry.
Polyglutamic Acid
- humectant
- polyglutamic acid
For your hair?
Whether Polyglutamic Acid matters for your hair depends on your hair.
6 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 — 6 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 2026-08-28. Product-page methodology: the product library.