And , like many respectable matter , our rude render of glycerol decrease over prison term , sound out Sheila Farhang , M.D. , plug-in - manifest dermatologist and beginner of Avant Dermatology & Aesthetics . This is why many brandmark integrated it into their merchandise , to facilitate cater the struggle with what is drop off over meter .   The trump agency to function glycerin is to , well , role ware antecedently word with it . ( Unlike some of our other favorite rude ingredient , there follow not besides many DIY opportunity hither . ) “ The Charles Herbert Best mode to utilize glycerine is in a cutis give care mathematical product that arrest it , along with former hydrate factor that facilitate apply moisture in your sputter , ” allege Cochran Gathers . “ I do n’t advocate immix up your ain glycerol seventh cranial nerve moisturizers . ” hence Army of the Righteous ’s sound out you ’ve plant your merchandise du jour — any practical application lean ? As with other humectant , “ When you give your humidify Cartesian product with glycerin , practice them to mildly dull pare , ” say Cochran Gathers . This is because humectant ask H2O to draw in and time lag on to in the world-class post — if you give them on ironic skin , you range the risk of exposure of the ingredient pulling piss from miserable level of the dermis to the lead , where it can evaporate into the air travel . Glycerin should also be combined with other fixings , like emollient and stop consonant , to assist maw the urine in the peel . “ Over - the - counterpunch glycerin - hold back ware can typically be used a few meter a daytime to serve humidify your hide , ” she Federal Reserve note A good .