While there's no regulation in the U.S. for what's in organic shampoos, they tend to contain ingredients perceived as safe or environmentally friendly. However, these "clean" shampoos separate and spoil faster than those made with synthetic stabilizers and preservatives. Now, researchers in ACS Sustainable Chemistry & Engineering demonstrate that a simple process—spinning organic shampoo at high speeds—improved the final products' shelf lives and ability to clean hair. Natural emulsifiers, such as xanthan gum and cetyl alcohol, are sometimes used to prevent organic shampoo from separating and enhance its soapy lather. However, they don't remain effective for as long as synthetic emulsifiers used in conventional haircare products. ....