Argan oil soap base with or without essential oils. Switching to a natural shampoo bar will change how your hair feels as shelf bought shampoos with sulfates strip the hair of its natural oils. There is also a transition period your body will go through to balance the production of natural hair oils as you use the natural shampoo bar. Rinsing your hair with 2 Tablespoons of Apple Cider Vinegar (organic with the mother) in 1 cup of water will help with this transition. Many people report using this rinse often at first with every wash or every other was and then being able to taper off the rinses to about once a week after their hair and scalp has adjusted to the natural ingredients in the shampoo bar (with natural oils).