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Home Cosmetic Science Talk Formulating Color and makeup PAO and Expiration Date

  • PAO and Expiration Date

    Posted by maka on March 10, 2023 at 10:32 am

    Hi Everyone!,

    I hope that someone can enlighten me on this…

    As per uncle Google;

    In cases where the shelf life exceeds 30 months an expiration date
    is not required to be placed on the packing, however a period after
    opening (PAO) is

    My question is; how do I determine the shelf life of makeup? is it by running stability of unopened product over 30 months? If it passes then there is no need for an expiration date (just PAO) and if it fails I need it + I also need PAO? Also, how do I determine PAO? What kind of testing do I need? Is it the same type of testing as for the expiration but using previously opened pieces? or maybe is there a set PAO for certain type of products i.e. 12m for lip glosses?

    Thank you!

    maka replied 1 week ago 2 Members · 2 Replies
  • 2 Replies
  • Perry44

    Professional Chemist / Formulator
    March 10, 2023 at 10:48 am

    Unfortunately, some questions do not have good answers. This is more of a legal / regulatory question than a formulation question.

    The quick answer is yes, stability testing.

    But PAO is pretty much a fairy tale since no one knows how long the product has been around before it was opened. What if the user buys a product, forgets it for 5 years, then tries to use the product? That certainly will have a different expiration point than a product opened 2 weeks after it was made.

  • maka

    Member
    March 15, 2023 at 1:08 pm

    Thanks, Perry.