Tetrasodium Glutamate Diacetate

Tetrasodium glutamate diacetate is a chelating agent (an EDTA alternative) typically used at low concentrations (~0.05–0.3%) to improve formula stability and preservative performance. Available safety and patch-test data for chelators in this class suggest low intrinsic irritancy at cosmetic use levels, though very reactive or barrier-impaired skin can occasionally experience stinging in multi-ingredient routines. Given its low exposure level but non-zero potential for sensitivity in compromised skin, a very gentle score is most clinically appropriate. Safety Notes: Tetrasodium Glutamate Diacetate is a chelating agent typically used at very low levels; in mainstream leave-on skincare and color cosmetics it is commonly present around ~0.05–0.20%, with the lowest observed commercial uses around 0.01% when included mainly to support preservative performance and reduce metal-ion catalyzed oxidation. In consumer rinse-off cleansers/shampoos and some high-performance/“preservative-boosted” or hard-water/soap-control formulas, I’ve observed it pushed to roughly 0.3–0.6% to enhance chelation robustness and formula stability, with higher levels generally constrained by cost and diminishing returns rather than regulatory limits.