Disodium EDTA
Disodium EDTA is a chelating agent in cosmetics that binds metal ions such as calcium, magnesium and iron in water; it stops the product's colour, smell and texture from deteriorating and boosts the effect of preservatives. At the low levels used in cosmetics, the risk to human health is low. The real debate is that it is a substance that breaks down poorly in nature.
Risk range
1 is the lowest and 10 the highest risk. The range depends on the amount used, whether the product is rinsed off and how it is used. The Temiz İçerik app uses the same ranges.
Because very little is absorbed through the skin, the risk to human health is low; the main factor raising the range is that it breaks down poorly in nature once it enters waste water and can carry metals.
What is disodium EDTA and what is it used for?
EDTA (ethylenediaminetetraacetic acid) is a synthetic compound that can grab and bind metal ions like a claw. Disodium EDTA is the sodium salt of this molecule, which dissolves easily in water. This binding process is called chelation, and the substances that do it are called chelating agents.
Metal ions in tap water and raw materials can cause oils in cosmetic products to go rancid, colours to change and scents to deteriorate. EDTA inactivates these ions, extending the product's shelf life. It also helps shampoos and soaps lather better in hard water and strengthens the action of preservatives such as phenoxyethanol against microbes.
Which products contain it?
- Shampoos, conditioners, shower gels and liquid soaps
- Moisturising creams and lotions
- Make-up and make-up removers
- Hair dyes and some cleaning products
On the label it appears as Disodium EDTA and is usually found near the end of the list, at a very low level. Tetrasodium EDTA and Calcium Disodium EDTA are other members of the same family.
Is it harmful? The scientific assessment
The independent Cosmetic Ingredient Review (CIR) panel concluded that EDTA and its salts are safe at the levels used in cosmetics. EDTA is absorbed very little through intact skin; irritation and allergy are rare.
Some sources claim that EDTA increases the skin's permeability, making it easier for other substances to be absorbed. This effect has been observed under laboratory conditions; at the low levels found in cosmetics, its practical significance is considered limited.
The real concern relates to the environment. EDTA does not break down easily in waste water treatment plants and can remain in nature for a long time. Because it can also bind and carry heavy metals in water, its environmental effects are being studied. This is why some manufacturers are turning to chelating agents that break down more easily in nature.
Who should be careful?
- People who care about environmental impact: You can choose products with alternative chelating agents that break down more easily in nature.
- Very sensitive skin: EDTA rarely causes problems; when there is a reaction, another ingredient in the formula is usually responsible.
What to do when you see it on a label
There is no health reason not to use a product containing disodium EDTA. If you are looking for an environmentally friendly option, look on the label for chelating agents that break down more easily in nature, such as Tetrasodium Glutamate Diacetate, Sodium Phytate or Trisodium Ethylenediamine Disuccinate. In some products, citric acid also plays a similar supporting role.
Frequently asked questions
Is EDTA carcinogenic?
No. EDTA is not classified as a carcinogen by IARC or the EU.
Why is EDTA a problem for the environment?
It does not break down easily in waste water, can remain in nature for a long time and can bind and carry heavy metals.
Are EDTA-free products healthier?
No significant difference is expected in terms of human health; the choice is based more on environmental reasons.
Does disodium EDTA damage the skin?
At the low levels used in cosmetics, it is not expected to damage the skin. It is absorbed very little through the skin, and irritation and allergy are quite rare.
Sources
Updated: 2026-10-11 · How we score
This page is for general information and is not personal medical advice. Warnings on the product label and the advice of a health professional always come first.