Use it in your soap, you will love it! I started with dumping it in the oils before I added the lye, but found that there would still be granules left. Now, I just mix the lye with the minimum water, like 1.1X lye, and then do 0.9X water to mix the buttermilk powder. I usually add it at trace for cold process, so that it doesn't get too burnt by the lye.