PH ADJUSTER
Disodium Phosphate
- pH adjuster
A buffering salt that keeps pH stable as the product ages.
- products in our library
- 94
- of researched products
- 2%
- on the label, in our conditioners
- usually #31
- 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.
The housekeeping this class does.
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 |
| Job | Sets acidity | 3 of 5 |
| Prominence | Secondary | 2 of 5 |
What it does for a formula
What Disodium Phosphate does
The general function first, then how the role changes by product type where we have researched it.
The cuticle lies flatter on the acidic side; this is how a formula gets there.
A little salt turns a thin detergent solution into a pourable gel.
Water alone removes it, so it does not accumulate between washes.
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 ? |
|---|---|---|
Conditioner
32 products
|
secondary · #31 | |
Mask / treatment
13 products
|
secondary · #27 | |
Shampoo
8 products
|
secondary · #28 | |
Styler: gel
8 products
|
secondary · #27 | |
Leave-in
7 products
|
secondary · #22 | |
Styler: smoothing cream
7 products
|
secondary · #27 | |
Scalp treatment
4 products
|
secondary · #33 | |
Styler: curl cream
4 products
|
secondary · #11 | |
Heat protectant
3 products
|
secondary · #19 | |
Styler: mousse
3 products
|
secondary · #45 |
4 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: texture spray
2 products
|
secondary · #20 | |
Finisher: anti frizz finish
1 product
|
secondary · #47 | |
Styler: edge control
1 product
|
secondary · #21 | |
Styler: paste
1 product
|
secondary · #48 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Conditioner | 32 | 5% | 31 | 16 | secondary |
| Mask / treatment | 13 | 3% | 27 | 12 | secondary |
| Shampoo | 8 | 1% | 28 | 8 | secondary |
| Styler: gel | 8 | 5% | 27 | 11 | secondary |
| Leave-in | 7 | 2% | 22 | 13 | secondary |
| Styler: smoothing cream | 7 | 13% | 27 | 10 | secondary |
| Scalp treatment | 4 | 3% | 33 | 30 | secondary |
| Styler: curl cream | 4 | 4% | 11 | 11 | secondary |
| Heat protectant | 3 | 2% | 19 | 16 | secondary |
| Styler: mousse | 3 | 2% | 45 | 20 | secondary |
| Styler: texture spray | 2 | 3% | 20 | 19 | secondary |
| Finisher: anti frizz finish | 1 | 4% | 47 | 47 | secondary |
| Styler: edge control | 1 | 6% | 21 | 21 | secondary |
| Styler: paste | 1 | 1% | 48 | 48 | secondary |
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 | 3 |
| 9-15 | Secondary | 14 |
| 16-25 | Lower | 33 |
| 26+ | Trace | 57 |
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.
pH adjusters are how a formula is brought to a chosen acidity, and an acidic formula keeps the cuticle lying flatter than an alkaline one. Which way this one moves the pH depends on the formula, and the finished pH is not on the label.
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 formula set to the acidity the cuticle prefers
- a thicker cleanser
- a rinse-clean feel
- 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 pH adjuster, 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
- 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.
- Sodium Phosphate · 74
- Hydroxyethylcellulose · 73
- Polysorbate 60 · 70
- Tocopherol · 50
- Caprylyl Glycol · 43
- Cetrimonium Chloride · 42
- Cetyl Alcohol · 41
- Behentrimonium Chloride · 41
- Benzyl Alcohol · 40
- Propanediol · 37
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, give the formula body and hold, 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.
DevaCurl · Shampoo
Low-Poo Delight
#8 on the label · $3.33/oz
DevaCurl · Shampoo
Low-Poo Original
#8 on the label · $2.16/oz
Klorane · Conditioner
Prickly Pear Hydration Shine Conditioner
#10 on the label · $2.36/oz
SEEN · Styler
Blow-Out Creme
#10 on the label · $5.80/oz
SEEN · Styler
SEEN Blow-Out Creme, Fragrance Free
#10 on the label · $5.80/oz
Curl Keeper · Styler
Curl Keeper Ultimate Frizz Control
#11 on the label · $4.33/oz
Rizos Curls · Styler
Defining Custard
#11 on the label · $2.20/oz
Rizos Curls · Styler
Defining Custard - 2.5 oz
#11 on the label · $4.40/oz
SEEN · Styler
Curly Creme
#11 on the label · $4.83/oz
SEEN · Styler
SEEN Curly Creme, Fragrance Free
#11 on the label · $4.83/oz
Eva NYC · Mask / treatment
H2-Whoa! Hydra-Jelly Hair Mask
#12 on the label · $1.91/oz
See all 94 products in the library that list Disodium Phosphate
Identity
What this entry is, and what our references call it.
Disodium Phosphate
- CAS 7558-79-4
- PubChem 24203
- salt
- disodium phosphate
For your hair?
Whether Disodium Phosphate matters for your hair depends on your hair.
94 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
Sourced Backed by a manufacturer or regulatory source.
This ingredient
- Manufacturer or regulatory PubChem — Compound identity: CID 24203, CAS 7558-79-4, HNa2O4P · accessed 2026-08-28
How this page was made
- Every number above is counted from the ingredient lists in our own product library — 94 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.