Tetrasodium EDTA
INCI: TETRASODIUM EDTA
Reviewed by Rosie · Last updated 14 Aug 2026
Also known as: Tetrasodium Edta
A chelating agent that stabilises formulations and supports purifying efficacy
Best For Skin Types
All
Addresses
Effective Concentrations
Up to 2%
Usage Frequency
Daily
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What Is Tetrasodium EDTA?
Tetrasodium EDTA is the sodium salt of ethylenediamine tetraacetic acid (EDTA), a chelating agent commonly used in skincare formulations. Chelating agents work by binding to metal ions—such as calcium, magnesium, and iron—that may be present in water or other ingredients, preventing these metals from interfering with product stability and performance.
In cosmetic formulations, tetrasodium EDTA is typically used at concentrations below 2%. Its primary role is to maintain formula integrity and shelf life by preventing unwanted chemical reactions triggered by trace metals. Research also suggests EDTA may enhance the antimicrobial and antibiofilm properties of other active ingredients when used in combination.
How It Works
Tetrasodium EDTA functions as a chelator by forming stable complexes with metal ions in the formula. This prevents these metals from catalysing oxidation or other degradation reactions that could compromise product efficacy or texture over time. By controlling metal presence, the ingredient helps preserve the intended performance of other active components.
When combined with other antimicrobial agents, tetrasodium EDTA may also potentiate their activity—meaning it can enhance their ability to address microorganisms and biofilms on the skin. The exact mechanism of this synergy is still being researched, but current evidence suggests it relates to how the chelating action affects microbial cell walls.
Clinical Evidence & References
Safety assessments have found tetrasodium EDTA to be well-tolerated in topical cosmetic use at typical concentrations. Clinical testing has reported no absorption of EDTA salts through intact skin, suggesting systemic exposure from skincare products is negligible. The ingredient is not carcinogenic, though it does show weak genotoxic potential in laboratory conditions at levels far exceeding cosmetic use.
Research into EDTA's antimicrobial and antibiofilm properties is emerging, particularly in wound care contexts. While these findings are promising, evidence specific to skincare formulations remains limited. Most benefit in this area likely depends on the specific combination of ingredients used alongside tetrasodium EDTA.
Published Research
How to Use
Tetrasodium EDTA is a behind-the-scenes stabilising ingredient rather than an active treatment, so there are no specific usage guidelines to follow. It will be listed in the ingredients of any product containing it. If you are using it as part of a multi-ingredient formulation, follow the usage instructions for the product as a whole.
Safety & Precautions
Frequently Asked Questions
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