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The castor oil helps because it thickens it up a lot instead of a thin, runny mess. You don't need it but I like it thicker. Stuffs cheap and you only use a little bit so it lasts forever.

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Tutorial - How to make your own Pre-shave oil | TheShaveDen
Here is a link to a recipe with a lot of additions and ideas. Been using this for a while and my shaves have never been smoother and my...