Yes! There are a couple of reasons to make a hybrid soap. For liquid soap, I use mostly KOH, but for body I use a little NaOH. For solid soap, using a little KOH helps very some oils lather better and cuts the 'slime' in 100% olive oil bars. I've never used it in shampoo bars, but I can see it if it's 5-10% or less of the lye.