Tetrasodium Iminodisuccinate

Tetrasodium iminodisuccinate is a synthetic chelating agent — a compound designed to bind and neutralise trace metals present in skincare formulations. These metals can come from water, raw materials, or processing equipment. By forming stable complexes with these ions, the ingredient helps preserve formula integrity and stability.In skincare, chelating agents work behind the scenes rather than delivering direct skin benefits. They are included to protect the efficacy of other actives and prevent unwanted chemical reactions that could degrade the product over time.

Tetrasodium iminodisuccinate works through chelation, a chemical process in which it binds tightly to metal ions (such as iron, copper, and zinc) that may be present in the formula. This prevents those metals from catalysing oxidation reactions — a process that can degrade active ingredients and reduce product efficacy.Because the metal ions are sequestered, they cannot interact with other ingredients in ways that might cause discolouration, separation, or loss of potency. This is particularly important in formulations containing antioxidants, vitamins, or other vulnerable actives.

This ingredient is used by formulators during product manufacture, not by consumers during application. There is no need to adjust usage based on this ingredient's presence. It works continuously within the bottle to maintain the stability of your skincare product.

Tetrasodium iminodisuccinate is generally well-tolerated and has a long history of safe use in cosmetics. It is not considered a skin irritant at typical use levels in finished products.