Recommend a shampoo that is gentle and does not contain harmful substances. And the ingredients that must be used together with the shampoo as well. I will order on the page but I am not sure which one to order. A friend recommended to order
Sulfate Free Shampoo Base (pH 7, Clear, Foaming) is considered gentle, can I use it? Do I have to order any additional ingredients to use together? Or you can use this shampoo head alone.