Home Cosmetic Science Talk Formulating Unpreserved Hydrosol

  • Unpreserved Hydrosol

    Posted by love on July 31, 2014 at 7:06 am

    Hi, I’m having a hard time sourcing out Organic Rose Hydrosol that is preserved for my formulations. I have heard that using an unpreserved one is risky. However I have found a nice organic Hydrosol that is unpreserved from a good source. Should I add leucidal preservative to it as soon as I open it? Do I need to preserve it at all? I do add it to my heated water phase of my formulations. Any take on this?

    The_Microbiologist replied 9 years, 11 months ago 6 Members · 7 Replies
  • 7 Replies
  • vjay

    July 31, 2014 at 8:27 am

    Can you explain it more that what is your final formulation, what is the pH of your final product.

  • OldPerry

    July 31, 2014 at 10:50 am

    Yes you need to preserve it.  If your supplier hasn’t preserved it then it is most likely contaminated.

  • The_Microbiologist

    August 1, 2014 at 11:28 am

    Perry’s right.  If a raw material is unpreserved and not well known by formulators/suppliers be inherently resistant to microbial contamination, then it’s probably contaminated or at least risky.  Certainly if it contains water and has a pH between about 5 and 10, then it should be preserved.

  • love

    August 5, 2014 at 7:55 am

    Thank you all for your take on this. I just don’t understand then why are these hydrosols sold unpreserved at the risk of contaminating our products?

  • Microformulation

    August 5, 2014 at 11:57 am

    These Hydrosols are sometimes sold without preservation to pander to the uber natural chemophobia. I see it with Crafters a lot. However they hopefully grow and realize preservatives are needed, especially in a product with such a high Aw.

  • Rencelj

    August 5, 2014 at 1:17 pm

    I do produce hydrosols and i do filtrate them. Till now i didnt preserv them, only stored in dark cold place. Must say, i had it over 1 year and wasnt any sign of contamination (not in appearance and not in odor). This year i will preserv it, i destill it 2 weeks ago and i need now to filtrate 1000l of lavender hydrosol.

  • The_Microbiologist

    August 6, 2014 at 6:28 pm

    Just so the gang that frequents this forum knows, it only takes one microorganism to completely contaminate and ruin an unpreserved, previously sterile cosmetic product or raw material, if that substance supports microbial growth.  Keeping something sterile requires good knowledge of microbiology/aseptic technique and a sterile work environment of some sort such as a laminar flow hood or biological safety cabinet.  In other words, it’s not practical for most non-pharma companies!

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