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01-31-2012 02:34 PM
I've read several posts directly from Skin Biology about the shelf life of their products being anywhere from 3-5 years, they do not provide an expiration date for their products, just the manufacturer date. I was going though my stuff and found a bottle of Skin Signals with a manufacturer date of 4/09 and am deciding if I should try it out again or not. Usually I don't use anything after 2 years, but with their stated 3-5 yrs shelf life and high stability claims maybe I will. What, if any, would be signs of a copper serum such as Skin Signals going bad?
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