1,3-Propanediol vs. Sodium Lactate

If you had to choose between the two, which would be best for hydrating face toner? Or just diluted and applied before an occlusive. I know glycerin is the standard humectant, but I want something less tacky. What are the drawbacks of each? Do they virtually produce the same effect?
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  • Propendiol is preferred over sodium lactate when formulating with polymeric emulsifiers that are sensitive to electrolytes. I usually use both Glycerin and Propendiol :)
  • abierose said:
    Propendiol is preferred over sodium lactate when formulating with polymeric emulsifiers that are sensitive to electrolytes. I usually use both Glycerin and Propendiol :)

    Would one work better in a formula rather than standalone (diluted of course)? Glycerin is too sticky for me to use by itself, even when diluted. Does Propanediol, if used conjunction with glycerine, alter the skin feel?

  • DaveStone said:
    abierose said:
    Propendiol is preferred over sodium lactate when formulating with polymeric emulsifiers that are sensitive to electrolytes. I usually use both Glycerin and Propendiol :)

    Would one work better in a formula rather than standalone (diluted of course)? Glycerin is too sticky for me to use by itself, even when diluted. Does Propanediol, if used conjunction with glycerine, alter the skin feel?

    Well, that's definitely a matter of preference 😉 I don't like my products to be sticky either so I keep the amount of glycerin low..like below 2-3%...and then I'll usually match that amount with propendiol. 
  • Sodium lactate is much better than the Propanediol as a humectant, but can destabilize the emulsion, also at certain percent can be photo-sensitizing. I use three humectants in my lotions - Glycerine, Propylene glycol and Sodium lactate, but I don't use polymeric thickeners, only Xanthan.
  • ggpetrov said:
    Sodium lactate is much better than the Propanediol as a humectant, but can destabilize the emulsion, also at certain percent can be photo-sensitizing. I use three humectants in my lotions - Glycerine, Propylene glycol and Sodium lactate, but I don't use polymeric thickeners, only Xanthan.

    Better, as in it penetrates deeper? Or holds more water?
  • DaveStoneDaveStone Member
    edited August 4
    By the way, why does the SDS sheet on Sodium Lactate mention to rinse skin if contact occurs? Is is irritable when undiluted?
  • DaveStone said:
    ggpetrov said:
    Sodium lactate is much better than the Propanediol as a humectant, but can destabilize the emulsion, also at certain percent can be photo-sensitizing. I use three humectants in my lotions - Glycerine, Propylene glycol and Sodium lactate, but I don't use polymeric thickeners, only Xanthan.

    Better, as in it penetrates deeper? Or holds more water?
    It can hold more moisture, also it's natural for the skin, as it is part of the NMF. About the irritation - I don't know! I have a client with a psoriasis, and her skin doesn't mind Sodium lactate in her lotion.
  • You have to rinse the skin if it contacted with any material even if it is not irritable.
    Even if sodium lactate is irritant, that is at 100% pure material. At 5% it doesn't have any irritation. 
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