Question from Patreon: Can cocamidopropyl betaine be used as the only surfactant in a shampoo?

In the July Q&A on my Patreon feed, Doris asked: I fell down this particular rabbit hole because I wanted to duplicate a simple shampoo that I love. (It’s this shampoo – Dirty Girl Farm, Bamboo Shampoo.)  I think the order of the ingredients is off, but according to the label they are: water, glycerin,…