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umm ok it might not be true as it was found in wikipedia but-

'It was once believed that when used as an emollient, glycerol should never be applied undiluted to the skin. It was thought that the...

I heard that using pure glycerin was a no no for your skin as it draws the mositure from your skin in too high a concentration. I used to use a drop or so in lather but didn't notice much improvment...