Tetrasodium Etidronate ●
TL;DR. This ingredient is a chelating agent that binds metal ions in formulas, especially in bar soaps and high-pH cleansers. It helps reduce discoloration, rancidity, soap scum, and performance loss caused by hard-water minerals.
What does Tetrasodium Etidronate do in a cosmetic formula?
This ingredient is a chelating agent that binds metal ions in formulas, especially in bar soaps and high-pH cleansers. It helps reduce discoloration, rancidity, soap scum, and performance loss caused by hard-water minerals.
Is Tetrasodium Etidronate clean?
From a clean-beauty perspective, it is generally low-irritation and not a common allergen, but it can raise standards friction because it is a synthetic phosphonate chelator. Some brands prefer plant-derived chelators when they can deliver the same stability.
Is Tetrasodium Etidronate sustainable?
This material is synthetic and not readily biodegradable, although it has low expected bioaccumulation. Its phosphorus-containing chemistry gives it more environmental scrutiny than readily biodegradable chelators.
Is Tetrasodium Etidronate COSMOS-approved?
It has limited or conditional alignment with COSMOS, most commonly associated with specific soap or rinse-off uses rather than broad natural-formula approval. From a Green Chemistry lens, its strong chelation and low use levels are practical, but its non-renewable sourcing and limited biodegradability keep it in the yellow tier.
How does Tetrasodium Etidronate work chemically?
The molecule is an organophosphonate salt with multiple ionizable groups that strongly complex calcium, magnesium, iron, and other trace metals. Typical use levels are low, often about 0.05% to 0.2%, and it is stable in alkaline systems where many traditional soaps need metal control.
Last updated 2026-05-14