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Whatever is in your supermarket or health-food store -- and if several brands, pick the least expensive.

You're putting in on your skin, not into your stomach.

. . . Charles

That's what I think is happening. The pre-shave oil (what doesn't get taken off by the lather) acts as a lubricant. It prevents the edge of the razor from scraping off a layer of skin.

I suspect...

Thanks for the tip. I occasionally use almond oil as a pre-shave -- after a shower, just before putting on lather -- and it works nicely like that.

Charles