EMULSIFIER
Stearic Acid
- emulsifier
A fatty acid that thickens creams and helps them hold their texture.
- products in our library
- 141
- of researched products
- 2%
- on the label, in our shampoos
- usually #25
- most common in
- Shampoo
- in water
- Oil-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.
How much oil it strips, as a class.
The foam the class is known for, not a measured volume.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Needs a cleanser | 4 of 5 |
| Rinse-out behaviour | Rinses with a cleanser | 2 of 5 |
| Cleansing strength | Not a cleanser | 1 of 5 |
| Lather | Little | 1 of 5 |
What it does for a formula
What Stearic Acid does
The general function first, then how the role changes by product type where we have researched it.
Without one, a cream separates in the bottle.
Changes the texture in your hand. It says nothing about what reaches your hair.
Nothing like a drying alcohol: a waxy solid that softens and thickens.
It takes a surfactant to remove, which matters on a low-detergent routine.
Charge
Charge is not recorded for this ingredient.
Solubility
Needs a surfactant to remove. On a low-detergent routine it can build up over time.
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 ? |
|---|---|---|
Shampoo
43 products
|
secondary · #25 | |
Styler: paste
23 products
|
supporting · #6 | |
Leave-in
17 products
|
secondary · #19 | |
Styler: curl cream
13 products
|
supporting · #5 | |
Conditioner
10 products
|
secondary · #18 | |
Mask / treatment
9 products
|
secondary · #21 | |
Finisher: oil
5 products
|
secondary · #14 | |
Heat protectant
4 products
|
secondary · #17 | |
Styler: mousse
4 products
|
supporting · #8 | |
Scalp treatment
3 products
|
secondary · #21 |
6 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: smoothing cream
3 products
|
leading · #3 | |
Co-wash
2 products
|
supporting · #5 | |
Styler: hairspray
2 products
|
supporting · #6 | |
Finisher: anti frizz finish
1 product
|
secondary · #42 | |
Styler: gel
1 product
|
supporting · #5 | |
Styler: lotion
1 product
|
supporting · #4 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Shampoo | 43 | 3% | 25 | 2 | secondary |
| Styler: paste | 23 | 12% | 6 | 2 | supporting |
| Leave-in | 17 | 2% | 19 | 1 | secondary |
| Styler: curl cream | 13 | 6% | 5 | 2 | supporting |
| Conditioner | 10 | 1% | 18 | 1 | secondary |
| Mask / treatment | 9 | 2% | 21 | 4 | secondary |
| Finisher: oil | 5 | 2% | 14 | 10 | secondary |
| Heat protectant | 4 | 2% | 17 | 4 | secondary |
| Styler: mousse | 4 | 2% | 8 | 6 | supporting |
| Scalp treatment | 3 | 1% | 21 | 5 | secondary |
| Styler: smoothing cream | 3 | 4% | 3 | 2 | leading |
| Co-wash | 2 | 2% | 5 | 3 | supporting |
| Styler: hairspray | 2 | 1% | 6 | 2 | supporting |
| Finisher: anti frizz finish | 1 | 3% | 42 | 42 | secondary |
| Styler: gel | 1 | 0% | 5 | 5 | supporting |
| Styler: lotion | 1 | 3% | 4 | 4 | supporting |
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 | 18 |
| 4-8 | Supporting | 30 |
| 9-15 | Secondary | 32 |
| 16-25 | Lower | 24 |
| 26+ | Trace | 37 |
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
Formulation guidance for specific hair conditions, limited to the label positions where it applies. It is not a conclusion about any finished product, or about you.
The waxy solid that gives a conditioner its body. It deposits a soft lubricating layer, which is most of what makes hair feel smooth after rinsing.
Deposits with the cationic conditioners and helps them lie flat along the strand, which is where the detangling actually comes from.
Near the top of a conditioner it is doing most of the conditioning, and most of the weighting, at the same time.
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 seeing this ingredient tells you, what it does not, and the limits of our own method.
- a stable cream that does not separate
- a thicker, easier-to-spread formula
- a rich cream texture
- something that lasts through the day
- 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 secondary emulsifier, listed below the main ingredients in our shampoos
- it was on the printed ingredient list of every product we counted (we read labels, not marketing copy)
- anything about what the product does on hair
- dryness (it is a waxy solid, not a drying alcohol)
- 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.
- Ethylhexylglycerin · 57
- Caprylyl Glycol · 51
- Glyceryl Stearate · 43
- Sodium Cocoyl Isethionate · 34
- Cetyl Alcohol · 33
- Disodium EDTA · 32
- Cocos Nucifera (Coconut) Oil · 31
- Tocopherol · 31
- Propylene Glycol · 30
- Benzyl Alcohol · 30
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to soften the strand, hold on to water, 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.
As I Am · Conditioner
Hemp Seed Oil Conditioner Bar
#1 on the label · $2.21/oz
As I Am · Leave-in
Hemp Seed Oil Leave-In Conditioner Bar
#1 on the label · $2.21/oz
18.21 Man Made · Styler
Sweet Tobacco Medium Hold, No Shine Hair Styling Clay
#2 on the label · $13.00/oz
American Crew · Styler
Whip
#2 on the label · $7.67/oz
Attitude · Shampoo
Clarifying Shampoo - Bar
#2 on the label · $3.99/oz
Attitude · Conditioner
Hydrating Conditioner - Bar
#2 on the label · $4.98/oz
Attitude · Shampoo
Hydrating Shampoo - Bar
#2 on the label · $3.99/oz
Attitude · Shampoo
Strengthening Shampoo Bar
#2 on the label · $3.99/oz
Attitude · Shampoo
Volumizing Shampoo - Bar
#2 on the label · $3.99/oz
Aveda · Styler
LIGHT ELEMENTS™ DEFINING WHIP™ creamy hair wax for texture and medium hold
#2 on the label · $13.60/oz
DevaCurl · Styler
CurlHeights™ Cream
#2 on the label · $4.83/oz
Attitude · Shampoo
Nourishing Shampoo - Bar
#3 on the label · $3.99/oz
Identity
What this entry is, and what our references call it.
Stearic Acid
- CAS 57-11-4
- PubChem 5281
- thickener
- fatty alcohol
- stearic acid
For your hair?
Whether Stearic Acid matters for your hair depends on your hair.
141 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
Sourced Backed by a manufacturer or regulatory source.
This ingredient
- Manufacturer or regulatory PubChem : Compound identity: CID 5281, CAS 57-11-4, C18H36O2 · accessed 2026-08-28
How this page was made
- Every number above is counted from the ingredient lists in our own product library: 141 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.
