SLS is known to be a mild carcinogenic and has usage in toilet cleaners and everywhere there's a need a of a harsh surfactant. It has a corrosive action and for hair it sucks the moisture out, clogs the hair roots, makes them dry that eventually leads to hair falling. See what these multinationals are doing to Indian hair ! Adding a low cost foaming agent to bring a feel-good factor to the users. Shame !
SLS free Shampoos are now available in India also. Segals Solutions products have a big range of them. I got these recently from Chennai