I also have a few testers who can pick out the butter soaps and like them the best. One of my BILs wants butter based soap and only butter based soap. Someone mentioned above that butters may cut lather. I found that to be true in younger soaps. With aging, on the order of 4-6 months, the butter soaps I made are making a very lovely lather. I’ve also been testing a soap made by another member that I believe is butter-based (no animal products for sure and likely no palm) although the recipe is still unknown to me. To me, it is very close to a lard-based soap, but feels just a tad lighter, in a good way.Thank you @DeeAnna! My first soapy lesson for the new year
Hardness and longevity.... If palm, tallow and lard aren't options hehehe
I'm gonna go on a limb here and say that I think they do, but I won't go as far as saying you absolutely need them, and won't be able to tell you what exactly lol. One of my mom's friends has tried several of my soaps - she buys my sample sized bars at cost to help me she says - and has now decided that the triple butter one is the best for her. She has spread the word to others in their group and some who have tried n used my other soaps have converted to this one. Must be something in the butters then, no?
I’m not willing to totally write off the potential for benefits from some EOs and natural additives in soaps. We know that some of the scents make it through saponification, as do plant color pigments, and we rely on constituents of rosemary for anti-oxidant protection. The published science is incredibly scarce, IMHO. If nothing else, some of these additives make soap that is very pleasing to use, which is enough for me to include them when the cost of doing so is not substantial.