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
- 257
- of researched products
- 7%
- on the label, in our shampoos
- usually #18
- most common in
- Shampoo
- 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 | 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 it is repelled rather than attracted, rinses away cleanly, and is the charge most detergents carry.
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 ? |
|---|---|---|
Shampoo
126 products
|
secondary · #18 | |
Conditioner
26 products
|
secondary · #24 | |
Styler: gel
22 products
|
secondary · #14 | |
Co-wash
18 products
|
secondary · #22 | |
Mask / treatment
11 products
|
secondary · #18 | |
Leave-in
10 products
|
secondary · #22 | |
Styler: mousse
9 products
|
secondary · #17 | |
Styler: paste
8 products
|
secondary · #16 | |
Scalp treatment
7 products
|
secondary · #14 | |
Heat protectant
5 products
|
secondary · #19 |
7 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: volumizer
5 products
|
secondary · #18 | |
Styler: smoothing cream
4 products
|
secondary · #27 | |
Styler: curl cream
2 products
|
secondary · #18 | |
Finisher: end oil
1 product
|
secondary · #26 | |
Finisher: serum
1 product
|
secondary · #23 | |
Styler: refresh spray
1 product
|
secondary · #19 | |
Styler: texture spray
1 product
|
secondary · #19 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Shampoo | 126 | 15% | 18 | 10 | secondary |
| Conditioner | 26 | 4% | 24 | 8 | secondary |
| Styler: gel | 22 | 14% | 14 | 8 | secondary |
| Co-wash | 18 | 18% | 22 | 9 | secondary |
| Mask / treatment | 11 | 3% | 18 | 11 | secondary |
| Leave-in | 10 | 2% | 22 | 8 | secondary |
| Styler: mousse | 9 | 6% | 17 | 10 | secondary |
| Styler: paste | 8 | 9% | 16 | 14 | secondary |
| Scalp treatment | 7 | 4% | 14 | 12 | secondary |
| Heat protectant | 5 | 3% | 19 | 12 | secondary |
| Styler: volumizer | 5 | 8% | 18 | 10 | secondary |
| Styler: smoothing cream | 4 | 7% | 27 | 17 | secondary |
| Styler: curl cream | 2 | 2% | 18 | 14 | secondary |
| Finisher: end oil | 1 | 11% | 26 | 26 | secondary |
| Finisher: serum | 1 | 1% | 23 | 23 | secondary |
| Styler: refresh spray | 1 | 8% | 19 | 19 | secondary |
| Styler: texture spray | 1 | 2% | 19 | 19 | 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 | 5 |
| 9-15 | Secondary | 83 |
| 16-25 | Lower | 131 |
| 26+ | Trace | 68 |
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.
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 this ingredient is evidence of, what it is not evidence of, and what our own method can and cannot tell you.
- 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 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 chelator, listed below the main ingredients in our shampoos
- 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.
- Cocamidopropyl Betaine · 111
- Sodium Chloride · 92
- Glycol Distearate · 69
- Propylene Glycol · 69
- Sodium Hydroxide · 68
- Methylisothiazolinone · 64
- Methylchloroisothiazolinone · 62
- Polyquaternium-10 · 60
- Hexyl Cinnamal · 60
- Benzyl Alcohol · 60
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.
Harry's · Styler
Harry's 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
American Crew · Styler
American Crew 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
Eco Style · Styler
Olive Oil Gel - 32.0 oz
#9 on the label · $0.31/oz
ECO STYLE · Styler
Olive Oil Styling Gel
#9 on the label · $0.31/oz
Wondercurl · Styler
Moisturizing Hair Pudding
#9 on the label · $3.75/oz
Aunt Jackie's · Styler
Curl Boss Coconut Curling Gelée
#10 on the label · $0.73/oz
See all 257 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 5th 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 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 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 — 257 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.