Tetrasodium EDTA is an extremely important ingredient for most soaps, shampoos, and cleansers. The reason its found in so many beauty cleansers and products being that this particular chemical is one of the best in cleaning away unwanted things. Tetrasodium EDTA is a chemical most often used as a chelating agent, which is a chemical agent that when used removes metallic ions from a substance – which directly translates to its ability to make hard water into soft water, so that the water is far easier to lather up. Hard water is water that has passed through far too many aging pipes to get to you and has along the way collected iron and calcium ions, making it ‘hard’ or unable to clean.
Soaps, cleansers, shampoos, these body/hair cleaners work to pull dirt, oil, and other body pollutants away from the skin and body. They also however attract the metal ions in the hard water preventing them from attracting as much dirt and oil as they can. A chelating agent like Tetrasodium EDTA neutralizes the metallic ions in the hard water allowing the cleaner to do its job the way it was intended.
Because of its usefulness as a chelating agent, Tetrasodium EDTA can also be found in other automobile and household cleansers. It is also used as a preservative because of its chelating agent properties. As it can remove metallic ions from the water and air it is exposed it, it can help preserve formulas it is added to because it improves the formulas stability when it is exposed to air, and helps prevent microbial growth in the products.