• Formulating

  Calculating parabens

  Posted by Anonymous on May 29, 2019 at 3:46 pm

  Does anybody know how should i calculate how much methylparaben and propylparaben should i add for this formula.

  90ml -Rose water 
  1g-vitamin E 
  1g-rosehip oil
  1g -tea tree oil 
  1g-hyaluronic acid
  1g- polysorbate 80
  2g -Mica
  methyl paraben and propylparaben -?

  Gunther replied 6 years, 1 month ago 1 Member · 1 Reply
• 1 Reply

• 

  Gunther

  Member

  May 29, 2019 at 4:24 pm

  EU regulations state that the maximum allowed is
  0.4% methylparaben, 0.14% propylparaben
  You can use a bit less than that, something like 90% or 75% of these maximum quantities.

  Albet those amounts don’t necessarily guarantee that the product will be preserved, so microbiological challenge tests are still needed in all commercial cosmetic formulations.

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