PRESERVATIVE
Sodium Benzoate
- preservative
A food-grade preservative that works only in acidic formulas, which is why it usually appears alongside citric acid.
- products in our library
- 2836
- of researched products
- 42%
- on the label, in our shampoos
- usually #16
- most common in
- Shampoo
- 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.
What it is in the formula to protect.
Where it sits on the labels we have, in the category it appears in most.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | Low | 1 of 5 |
| Rinse-out behaviour | Rinses clean | 5 of 5 |
| Role | Keeps water-based formulas | 4 of 5 |
| Prominence | Secondary | 2 of 5 |
What it does for a formula
What Sodium Benzoate does
The general function first, then how the role changes by product type where we have researched it.
Anything with water in it needs one, over the life of the bottle.
Water alone removes it, so it does not accumulate between washes.
Charge
Negatively charged, like the hair surface itself, so hair pushes it away instead of holding on to it. It rinses off easily, and most detergents carry this charge.
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 ? |
|---|---|---|
Shampoo
1063 products
|
secondary · #16 | |
Conditioner
530 products
|
secondary · #22 | |
Leave-in
275 products
|
secondary · #24 | |
Mask / treatment
222 products
|
secondary · #25 | |
Scalp treatment
110 products
|
secondary · #23 | |
Styler: mousse
77 products
|
secondary · #22 | |
Heat protectant
74 products
|
secondary · #21 | |
Styler: gel
72 products
|
secondary · #19 | |
Styler: volumizer
71 products
|
secondary · #21 | |
Styler: curl cream
56 products
|
secondary · #25 |
15 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Finisher: serum
39 products
|
secondary · #22 | |
Styler: paste
35 products
|
secondary · #26 | |
Co-wash
34 products
|
secondary · #25 | |
Styler: hairspray
26 products
|
secondary · #20 | |
Styler: smoothing cream
26 products
|
secondary · #24 | |
Styler: texture spray
26 products
|
secondary · #18 | |
Dry shampoo
23 products
|
secondary · #18 | |
Finisher: oil
18 products
|
secondary · #14 | |
Finisher: shine spray
14 products
|
secondary · #21 | |
Styler: refresh spray
13 products
|
secondary · #22 | |
Styler: edge control
12 products
|
secondary · #22 | |
Finisher: anti frizz finish
9 products
|
secondary · #18 | |
Styler: lotion
9 products
|
secondary · #28 | |
Finisher: end oil
1 product
|
secondary · #13 | |
Lightener
1 product
|
secondary · #28 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Shampoo | 1063 | 68% | 16 | 5 | secondary |
| Conditioner | 530 | 47% | 22 | 5 | secondary |
| Leave-in | 275 | 40% | 24 | 3 | secondary |
| Mask / treatment | 222 | 38% | 25 | 3 | secondary |
| Scalp treatment | 110 | 38% | 23 | 5 | secondary |
| Styler: mousse | 77 | 38% | 22 | 6 | secondary |
| Heat protectant | 74 | 36% | 21 | 4 | secondary |
| Styler: gel | 72 | 27% | 19 | 2 | secondary |
| Styler: volumizer | 71 | 49% | 21 | 5 | secondary |
| Styler: curl cream | 56 | 25% | 25 | 7 | secondary |
| Finisher: serum | 39 | 28% | 22 | 4 | secondary |
| Styler: paste | 35 | 18% | 26 | 7 | secondary |
| Co-wash | 34 | 34% | 25 | 11 | secondary |
| Styler: hairspray | 26 | 11% | 20 | 7 | secondary |
| Styler: smoothing cream | 26 | 32% | 24 | 7 | secondary |
| Styler: texture spray | 26 | 27% | 18 | 5 | secondary |
| Dry shampoo | 23 | 18% | 18 | 5 | secondary |
| Finisher: oil | 18 | 7% | 14 | 7 | secondary |
| Finisher: shine spray | 14 | 14% | 21 | 6 | secondary |
| Styler: refresh spray | 13 | 37% | 22 | 7 | secondary |
| Styler: edge control | 12 | 32% | 22 | 7 | secondary |
| Finisher: anti frizz finish | 9 | 28% | 18 | 8 | secondary |
| Styler: lotion | 9 | 25% | 28 | 11 | secondary |
| Finisher: end oil | 1 | 13% | 13 | 13 | secondary |
| Lightener | 1 | 33% | 28 | 28 | 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 | 3 |
| 4-8 | Supporting | 221 |
| 9-15 | Secondary | 777 |
| 16-25 | Lower | 849 |
| 26+ | Trace | 986 |
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.
- a product that keeps over its shelf life
- 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 secondary preservative, 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)
- that the product would be better without one
- 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.
- Benzyl Alcohol · 1031
- Sodium Chloride · 937
- Ethylhexylglycerin · 858
- Cocamidopropyl Betaine · 848
- Guar Hydroxypropyltrimonium Chloride · 835
- Tocopherol · 762
- Cetrimonium Chloride · 737
- Sodium Hydroxide · 689
- Behentrimonium Chloride · 660
- Caprylyl Glycol · 657
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to carry the formula and let it dry, keep the formula stable, and soften the strand.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
L'anza · Styler
Healing Style Mega Gel
#2 on the label · $3.23/oz
Olaplex · Mask / treatment
No.0 Intensive Bond Building Hair Treatment
#3 on the label · $9.61/oz
Suave · Leave-in
All In One Magic Mist Multi-Benefit Leave In Spray
#3 on the label · $0.44/oz
Equate · Leave-in
Baby Tear-Free Detangler Spray
#4 on the label · $0.27/oz
Johnson's · Leave-in
No More Tangles Detangling Spray
#4 on the label · $0.54/oz
Kenra · Leave-in
Daily Provision
#4 on the label · $2.25/oz
Suave · Heat protectant
Essentials Heat Protection Shield Spray
#4 on the label · $0.38/oz
TRESemme · Finisher
Keratin Smooth Weightless Silk Serum
#4 on the label · $2.42/oz
American Crew · Styler
Boost Powder
#5 on the label · $46.48/oz
Christophe Robin · Styler
Instant Volumizing Leave-in Mist with Rose Water
#5 on the label · $7.69/oz
d:fi · Styler
Volume Powder
#5 on the label · $46.67/oz
Davines · Styler
This is a Texturizing Dust
#5 on the label · $146.43/oz
See all 2836 products in the library that list Sodium Benzoate
Identity
What this entry is, and what our references call it.
Sodium Benzoate
- CAS 532-32-1
- PubChem 517055
- sodium benzoate
- sodium benzoate (food-grade preservative)
For your hair?
Whether Sodium Benzoate matters for your hair depends on your hair.
the 2nd most-listed preservative or antioxidant in our libraryWhat 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 517055, CAS 532-32-1, C7H5NaO2 · accessed 2026-08-28
How this page was made
- Every number above is counted from the ingredient lists in our own product library: 2836 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.
