What it is
The register’s chemical name for it: “L-Aspartic acid, N,N'-1,2-ethanediylbis-, trisodium salt.”
- EU register name (INCI)
- TRISODIUM ETHYLENEDIAMINE DISUCCINATE
- CAS number
- 20846-91-7 / 178949-82-1
What the register lists it for
These are the uses the European Commission’s CosIng register lists for Trisodium Ethylenediamine Disuccinate in any cosmetic, hair roles first. They say why a maker might add it, not what it does in one formula, and they aren’t a safety rating.
- Chelating
-
Binds metal ions, such as those in hard water, so they don’t spoil the product. Clarifying shampoos often list one.
Register definition: “Forming complexes with metal ions which could affect the stability and/or appearance of cosmetics.”
Where it sits on each label
US labels list ingredients from most to least, except that those at 1% or less may follow in any order. A name near the top is a large part of the formula. A label doesn’t mark where the 1% point falls, so further down, the order says little about how much is in it.
- Shampoos 5 labels First five names: 0 of 5 Shampoos without it
- Clarifying shampoos 1 label First five names: 0 of 1 Clarifying shampoos without it
- Rinse-out conditioners 1 label First five names: 0 of 1 Rinse-out conditioners without it
- Deep conditioners 1 label First five names: 0 of 1 Deep conditioners without it
- Heat protectants 1 label First five names: 0 of 1 Heat protectants without it
Every label, product by product (9)
- Innersense Organic Beauty Hydrating Cream Hairbath Shampoo 10th of 35 names
- Cantu Ultra Moisture Nourishing Shampoo Shampoo 20th of 31 names
- OLAPLEX No.4 Bond Maintenance Strengthening Shampoo Shampoo 60th of 78 names
- OLAPLEX Nº.4CURL Bond Shaper Hydrating Curl Shampoo Shampoo 49th of 62 names
- DevaCurl No-Poo Original Shampoo 18th of 22 names
- OLAPLEX No.4C Bond Maintenance Clarifying Shampoo Clarifying shampoo 40th of 55 names
- OLAPLEX No.5 Bond Maintenance Strengthening Conditioner Rinse-out conditioner 55th of 66 names
- Cantu Ultra Moisture Nourishing Mask Deep conditioner 19th of 26 names
- OLAPLEX Nº.9 Bond Protector Nourishing Hair Serum Heat protectant 19th of 31 names
Each line runs from the first name on a label to the last; a dot is where this ingredient sits. Makers change formulas now and then; if the list on your bottle differs, go by your bottle.
Your next step
Other chelating ingredients on these labels
- Disodium EDTA 38 labels
- Tetrasodium Glutamate Diacetate 13 labels
- Caprylhydroxamic Acid 9 labels
- Sodium Gluconate 7 labels
- Phytic Acid 6 labels
- Tetrasodium EDTA 6 labels
- Gluconolactone 5 labels
- Calcium Gluconate 4 labels
Updated · The name, numbers and uses come from the European Commission’s CosIng entry (CC BY 4.0); we write the uses in US spelling and put the hair ones first. The labels are each maker’s own. The order rule is the FDA’s Cosmetics Labeling Guide. All our sources are on the Sources page.