Zinc ricinoleate is one of the active ingredients in this deodorant that help make it effective. If you are desperate to try and really can't find it, you can try leaving it out, but know that the deodorant will be less effective. Because zinc ricinoleate is normally a waxy ingredient, you should replace it with an extra gram or two of beeswax to help keep the deodorant solid. If you just leave it out, you'll end up with more of a cream than a solid deodorant. I personally have always used zinc ricinoleate because I need the extra effectiveness. Over the years, I've heard from several people who have made the deodorant without it. It has been effective for some, and not so much for others. Using them together, though, I have yet to hear from someone who says it doesn't work for them. So, if you can find it, add it!