Mamabears soap has a super amount of glycerin already in it so you don’t have to add any extra. When I melt down Colleens soaps to put in my soap jars I will add half a teaspoon of glycerin to the melted soap. That way I don’t have to mess with adding any when I lather, and I get uberlather. I usually end up with lather splashed on the mirror from whisking up a mug of lather. I have too much to do in the morning to worry about bathroom chemistry so I just add it to the soap when I get it.