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Is it true that glycerin is the only moisturising polyol?
Several other polyols were tested (four weeks of treatment) as skin conditioners on pig dry skin (n = 3) to determine their effectiveness. Liquids such as ethylene glycol, propylene glycol, and 1,3-propanediol (tested as 10% and 50% aqueous solutions) did not provide a skin-conditioning benefit. These liquids are volatile and simply evaporate from the skin surface and thus provide no benefit. Aqueous solutions (10% and 50%) of crystalline polyols such as erythritol, xylitol, and sorbitol provided only a marginal benefit (<0.5 grade units improvement). These solids tend to crystallize on the skin surface when the water evaporates.Testing of a variety of polyols revealed that crystalline and volatile liquid polyols were ineffective in long-term benefits. It appears that a hygroscopic, nonvolatile, viscous polyol (glycerol) is best suited to function as an effective skin-conditioning agent.http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.534.7488&rep=rep1&type=pdf
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