Comments

• crisbaysauli Member

  January 2015

  I would suggest the usual sodium benzoate/ potassium sorbate when the pH is 4.0-5.0. What exactly is the application of your mist?
• cossci21 Member

  January 2015

  face mist, leave on product.
  how much do you recommend?
  
  thanks
  
• crisbaysauli Member

  January 2015

  Maximum allowable limits for leave on products are:

  
  

  Sodium benzoate - 0.5% Potassium sorbate 0.6%. You have to perform a preservative efficacy test to prove the micro stability of your mist.
• Perry Administrator, Professional Chemist

  January 2015

  The best in terms of functionality?  DMDM Hydantoin plus Methylparaben.

  
  

  
  

  Learn to formulate cosmetics
• MakingSkincare Member, Professional formulator

  January 2015 edited January 2015

  cossci21 those two organic acids will likely not be sufficient and sodium benzoate has failed some patch tests we carried out.  There's far more to preservation than just adding a preservative. You need a strategy.  Handy checklist and reviews of 27 preservatives here -
  
  http://www.makingskincare.com/preservatives/
  

  Jane Barber
  www.makingskincare.com
  www.learncosmeticformulation.com (free online course)
  Formulation discussion forum (18,000 members): www.facebook.com/groups/makingskincare/
  
• cossci21 Member

  February 2015

  Thanks everyone
  aware of pot sorbate and sodium benzoate, pot sorbate is a a irritant and need a low pH to be active so will definitely not use that.
  Aware of parabens an love them but not for our natural clients unfortunately. :-(