(I've never been one to shy away from controversy.) I hate what sodium cocoate does to my hands. I have a 0-2% superfat bar with at most 20% coconut oil. It doesn't merely dry my hands; it makes them feel like the skin is rough and has been abraded. The bar passes the zap test even when I cut into the inside (and does not leave a slippery lye feeling on fingers), but it makes my skin feel like I've washed dishes for an hour with pure SLS. Just kidding about the SLS (also known as SDS), because in fact I do wash dishes with mostly sodium lauryl sulfate. It typically doesn't mess up my skin. I know this chemical has a bad reputation online, but from what I've read about it, it's considered okay to leave on skin at up to 1% of a formulation like a cream, so it should be okay at higher rates in a soap combo bar which is washed off. And from what I've read about traditional soaps, they are irritating on skin. My experience bears this out: Dr. Bronner's castile soap did such a number on me that I thought I had eczema. I was going to make a soap that simply had no coconut oil, but I worried about it not making foam or not being effective as a soap. I realized instead, I could make a combo bar (soap/syndet) by substituting SLS instead of coconut oil. I decided to use just a bit, as insurance to be sure the soap would soap. The recipe I chose was: 60% canola oil 30% lard 10% olive oil (just to use it up) 5% castor oil 2% SLS relative to the oil weight 2% trisodium citrate as preservative (see the Kevin Dunn study) and to help if the water gets a bit hard 2% sodium acetate to help make the bar hard 0.5-1% EDTA as preservative (chelating agent) and to help if the water gets a bit hard A big pinch (what an unscientific measurement) of salt thrown in on impulse, since I was worried about the bar being too soft. The batch was just 115 g oils, so a big pinch is not nothing. 0.1% TBHQ (was supposed to be BHT but the seller sent me the wrong oil-type antioxidant) The lye is over 99% pure and I chose a 5.5% superfat. I used a strong ginger tea instead of most of the water, and 2% essential oils. There is no way I'm going to be able to wait for this to cure! I'll post back in a day or two to say how it works, after using it in the shower and on my hands.