HARD-WATER CHELATOR
Tetrasodium EDTA
- hard-water chelator
Binds the metal ions in hard water so they cannot dull hair or destabilise the formula.
- products in our library
- 500
- of researched products
- 7%
- on the label, in our shampoos
- usually #17
- 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.
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 | Ties up hard-water minerals | 4 of 5 |
| Prominence | Secondary | 2 of 5 |
What it does for a formula
What Tetrasodium EDTA does
The general function first, then how the role changes by product type where we have researched it.
Stops calcium and iron in tap water dulling a wash.
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
246 products
|
secondary · #17 | |
Conditioner
51 products
|
secondary · #22 | |
Leave-in
39 products
|
secondary · #18 | |
Styler: gel
37 products
|
secondary · #12 | |
Mask / treatment
24 products
|
secondary · #17 | |
Styler: paste
20 products
|
secondary · #17 | |
Co-wash
16 products
|
secondary · #29 | |
Styler: curl cream
15 products
|
secondary · #18 | |
Styler: mousse
13 products
|
secondary · #17 | |
Scalp treatment
10 products
|
secondary · #15 |
9 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: volumizer
10 products
|
secondary · #16 | |
Heat protectant
7 products
|
secondary · #19 | |
Styler: smoothing cream
3 products
|
secondary · #27 | |
Styler: texture spray
3 products
|
secondary · #13 | |
Styler: lotion
2 products
|
secondary · #19 | |
Finisher: anti frizz finish
1 product
|
secondary · #13 | |
Styler: edge control
1 product
|
secondary · #14 | |
Styler: hairspray
1 product
|
secondary · #11 | |
Styler: refresh spray
1 product
|
secondary · #19 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Shampoo | 246 | 16% | 17 | 7 | secondary |
| Conditioner | 51 | 5% | 22 | 8 | secondary |
| Leave-in | 39 | 6% | 18 | 8 | secondary |
| Styler: gel | 37 | 14% | 12 | 8 | secondary |
| Mask / treatment | 24 | 4% | 17 | 11 | secondary |
| Styler: paste | 20 | 10% | 17 | 10 | secondary |
| Co-wash | 16 | 16% | 29 | 9 | secondary |
| Styler: curl cream | 15 | 7% | 18 | 9 | secondary |
| Styler: mousse | 13 | 6% | 17 | 10 | secondary |
| Scalp treatment | 10 | 3% | 15 | 12 | secondary |
| Styler: volumizer | 10 | 7% | 16 | 10 | secondary |
| Heat protectant | 7 | 3% | 19 | 12 | secondary |
| Styler: smoothing cream | 3 | 4% | 27 | 17 | secondary |
| Styler: texture spray | 3 | 3% | 13 | 10 | secondary |
| Styler: lotion | 2 | 6% | 19 | 14 | secondary |
| Finisher: anti frizz finish | 1 | 3% | 13 | 13 | secondary |
| Styler: edge control | 1 | 3% | 14 | 14 | secondary |
| Styler: hairspray | 1 | 0% | 11 | 11 | secondary |
| Styler: refresh spray | 1 | 3% | 19 | 19 | 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 | 7 |
| 9-15 | Secondary | 166 |
| 16-25 | Lower | 221 |
| 26+ | Trace | 106 |
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.
Binds the calcium and magnesium in hard water, which is what stops mineral deposits accumulating on the strand wash after wash.
Copper and iron carried in tap water deposit on the strand and read as a dull, warm cast on gray or light hair. A chelator holds those metals in solution so the wash carries them off.
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 formula built for hard water
- a rinse-clean feel
- a routine that does not build up
- gray or light hair to stay cool rather than warm
- 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 chelator, 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 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.
- Cocamidopropyl Betaine · 224
- Sodium Chloride · 160
- Ethylhexylglycerin · 149
- Glycol Distearate · 140
- Guar Hydroxypropyltrimonium Chloride · 138
- Benzyl Alcohol · 134
- Propylene Glycol · 132
- Methylisothiazolinone · 129
- Dimethicone · 128
- Methylchloroisothiazolinone · 124
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to clean and build foam, 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.
Equate · Shampoo
Kids 3-in-1 Body, Hair & Bubble Bath, Lavender
#7 on the label · $0.14/oz
Harry's · Styler
Sculpting Gel
#8 on the label · $1.34/oz
PATTERN · Styler
Strong Hold Gel - 15.0 oz
#8 on the label · $1.93/oz
Paul Mitchell · Conditioner
Tea Tree Special Conditioner
#8 on the label · $3.34/oz
Suave · Leave-in
Kids Detangler Spray Berry Awesome
#8 on the label · $0.50/oz
Suave · Leave-in
Kids Silly Apple Detangler Spray
#8 on the label · $0.50/oz
TRESemme · Shampoo
24 Hour Volume Shampoo for Fine Hair
#8 on the label · $0.27/oz
American Crew · Styler
Firm Hold Styling Gel
#9 on the label · $1.99/oz
American Crew · Styler
Light Hold Styling Gel - 13.1 oz
#9 on the label · $1.87/oz
Curl Junkie · Co-wash
Daily Fix Cleansing Conditioner
#9 on the label · $2.00/oz
Dove · Shampoo
Damage Therapy Coconut Hydration Shampoo
#9 on the label · $0.32/oz
Eco Style · Styler
Olive Oil Styling Gel
#9 on the label · $0.31/oz
See all 500 products in the library that list Tetrasodium EDTA
Identity
What this entry is, and what our references call it.
Tetrasodium EDTA
- CAS 64-02-8
- PubChem 6144
- tetrasodium edta
- tetrasodium edta (incidental)
For your hair?
Whether Tetrasodium EDTA matters for your hair depends on your hair.
the 6th most-listed chelator or pH adjuster 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 6144, CAS 64-02-8, C10H12N2Na4O8 · accessed 2026-08-28
How this page was made
- Every number above is counted from the ingredient lists in our own product library: 500 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.
