Humans produce more oil on the surface of their skin than our closest relatives (1).…
We did not evolve to need foaming products and they do more harm than good.
Surfactants remove the natural oil from skin and disrupt barrier function causing sub-clinical inflammation, skin sensitivity and accelerated aging. Foaming agents also disrupt the skin’s microbiome … the ecosystem of microbes that is needed for optimum skin health.
In the century since soap has become part of our daily routine, inflammatory skin diseases like acne and eczema have exploded in their prevalence. These diseases are very rare or absent in hunter-gatherer communities.