Tetrahydroxypropyl Ethylenediamine

Tetrahydroxypropyl Ethylenediamine is primarily used as an alkalizing/pH-adjusting agent and amine-based buffering component, typically at low concentrations, but amines can be irritating in reactive skin—especially if they raise formula pH or are present in leave-on products. Patch-test data and real-world use suggest low-to-moderate irritancy overall, with occasional stinging or dermatitis in sensitized individuals, so I score it as mild to reflect meaningful but not dominant irritation risk in sensitive populations. Safety Notes: Tetrahydroxypropyl Ethylenediamine is most commonly used as an alkalizing/buffering agent (often paired with carbomer/acrylates thickeners) and typically appears at very low levels (~0.05–0.5%) in leave-on creams/lotions, sunscreens, and color cosmetics to neutralize and adjust viscosity/pH. Higher-strength consumer products (notably depilatories and some high-alkalinity hair/skin systems where it functions as a strong pH adjuster) can use it around 1–3% to achieve the required pH and performance, while remaining within typical supplier-recommended use levels for OTC cosmetics; rinse-off formats are more likely to sit toward the upper end than leave-on products.