The United States Food and Drug Administration lists STPP as “generally recognized as safe.”

Is STPP toxic?

It is also known as pentasodium salt or triphosphoric acid. STPP is also an ingredient in detergents and soaps. Most gel, liquid, tablet, and powder forms of both laundry and dishwasher detergent contain STPP. As a food, it is generally regarded as safe, but large ingested amounts of the product can be toxic.

Is trisodium phosphate cancerous?

TSP is linked to cancer, kidney damage, calcium deficiency, and osteoporosis.” … According to the National Institute of Health (NIH), trisodium phosphate is used in soap powders, detergents, antimicrobial cleaners, and other cleaning agents.