Chelating Agent

Calcium Disodium EDTA

INCI: CALCIUM DISODIUM EDTA

Reviewed by Kate · Last updated 14 Aug 2026

A chelating agent that binds metals and helps stabilise skincare formulations

Best For Skin Types

All

Effective Concentrations

Less than 2%

Usage Frequency

As part of the formulated product

What Is Calcium Disodium EDTA?

Calcium disodium EDTA is a chelating agent—a molecule designed to bind to metal ions and remove them from a formulation. It is derived from ethylenediamine tetraacetic acid (EDTA) and is used in skincare products to prevent oxidation and maintain product stability by trapping trace metals that might otherwise degrade active ingredients or alter product texture and colour.

In cosmetic formulations, it works behind the scenes rather than as an active treatment ingredient. Its primary role is preservative support: by sequestering metals, it helps extend shelf life and maintain the efficacy of other components in the product.

How It Works

Calcium disodium EDTA works by surrounding and binding to metal ions (such as iron, copper, or zinc) that may be present in skincare formulations or introduced during manufacturing and storage. This process, called chelation, prevents these metals from participating in chemical reactions that would otherwise degrade active ingredients or cause discolouration.

At the concentrations used in skincare (typically under 2%), the ingredient is not absorbed through intact skin. Its benefit to your skin is indirect—by keeping the product stable and its other ingredients effective, it supports the overall performance of the formulation.

Clinical Evidence & References

Research confirms that EDTA salts function effectively as chelating agents and are not absorbed through the skin at the concentrations used in cosmetics. Safety assessments have established that these ingredients are well-tolerated in topical applications when used at approved levels.

Animal studies suggest EDTA can affect how permeable the skin barrier is to other substances, though the practical significance of this in low-concentration cosmetic formulations remains unclear. No adverse effects have been reported from typical skincare use in humans.

How to Use

Calcium disodium EDTA is a formulation ingredient rather than an active treatment, so there is no special usage protocol required. It is present in the product to maintain stability; simply use the skincare product as directed by the manufacturer. No additional steps or timing considerations are necessary.

Safety & Precautions

Calcium disodium EDTA is considered safe for use in cosmetics at approved concentrations and is not absorbed through the skin. It is well-tolerated and suitable for all skin types.

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