Humectants: Which one is preferable?
I am looking to use a humectant which can potentially help in really cutting down on the evaporation of the water in my face cream formula. I have a few options I’ve come across so far outside of the amino acids, if they do in fact have humectant properties (trimethylglycine/betaine?). They are: sorbitol, propylene glycol, glycerin, butyl glycol and dipropylene glycol. I understand that MPG seems to be the least viscous but it does seem to irritate the skin of some users, though I am unsure whether at low concentrations of 3-6% it would still do this to some. I do feel the irritation when used at neat levels. I am wondering if dipropylene glycol would be a good alternative or if one of the other glycols or sorbitol would be an even better option. Any insights?
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