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Tetrasodium Etidronate

Helps oil and water mix.

What it is

A salt of etidronic acid, made in a lab.

Binds metal ions that could otherwise affect the product's stability and appearance, and helps adjust its thickness.

A short summary from the dictionary, not yet an in-depth article. About these entries

What it does in a formula

Helps oil and water mixOfficial EU function: Emulsion stabilising
Keeps the formula stableOfficial EU function: Chelating
Gives the textureOfficial EU function: Viscosity controlling

What official sources say

Restricted in certain uses · Cosmetics, EU

Allowed in EU cosmetics only within set limits and conditions (Annex III, entry 53).

Regulation (EC) No 1223/2009, Annex III: list of substances which cosmetic products must not contain except subject to the restrictions laid down (CosIng), retrieved 2026-10-09

A label gives no amounts, so none of this says a product is unsafe.