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Ingredient · INCI reference

Trisodium Ethylenediamine Disuccinate

A readily biodegradable chelating agent that protects sunscreen formulas by binding stray metal ions.

Ingredient illustration

Editorial ingredient illustration for Trisodium Ethylenediamine Disuccinate

An editorial illustration of this ingredient.

What it is

This is a biodegradable alternative to EDTA that binds trace metal ions in a formula. By tying up those metals, it helps keep the product stable, preserves color and clarity, and supports the preservative system.

Safety & warnings

Used at low levels and generally regarded as non-irritating; valued for its environmental profile.

Origin & sourcing

Synthetic chelator; the EDDS structure also occurs in nature and is chosen for its biodegradability.

Questions everyone asks

What is a chelating agent for?

It binds stray metal ions that would otherwise degrade the formula, helping it stay stable and effective.

How is it different from EDTA?

It does a similar job but is more readily biodegradable, so it is often chosen for greener formulas.

Sources & references

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