Kind of a newbie question, but since i been on here, i always here the word Glycerin tossed around and never really understood what its used for or its benefit. I know its an active ingredient in some creams and soaps, but do you guys buy it and actually incorporate into your lathers? If so id like to give it a whirl, no pun intended, what kind should i buy there seems to be a variety of choices. How much should i use per batch of lather? thank you