Castile soap is a vegetable-based soap that is free of toxins ... on the market contain a surfactant, most often sodium lauryl sulfate or sodium laureth sulfate, that traps oils and contaminants ...

“Sodium lauryl sulfate, which is the harshest of the sulfates, is the same ingredient used in Dawn dish soap.” So if you wouldn’t wash your hair with Dawn, it’s probably best to find a ...