Ingredient Potency of Jarred Moisturizers?

Unknown Member
edited May 2014 in Science
Saw an interesting discussion on a review of a moisturizer on the Sephora website. A consumer quoted Paula's Choice...

"The fact that this moisturizer is packaged in a jar means the beneficial ingredients won't remain stable once it is opened. All plant extracts, vitamins, antioxidants, and other state-of-the-art ingredients break down in the presence of air, so once a jar is opened and lets the air in these important ingredients begin to deteriorate ."

What do you all think about the stability of
  • plant extracts
  • vitamins
  • antioxidants
in jarred products?

-Mica

Comments

  • PerryPerry Administrator, Professional Chemist
    This really depends what you mean by stability.  Plant extracts as sold to the cosmetic industry are stable.  No amount of air exposure is going to change that.  

    Vitamins can be stable or not.  Vitamin C is the one that can oxidize in the presence of air but the reality is that it probably oxidized before it was put into the packaging anyway.  Topical application of even pure Vitamin C has little proven effect.

    Antioxidants?  I don't know.  Again it depends on what you want the antioxidant to do.  Superoxidedismutase isn't going to do anything when delivered from a topical formula whether it was air sealed shut or not.  Mostly antioxidants in skin creams are useful for keeping the formula stable but that's about it.
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