Copper peptide serums have a shorter shelf life of 18months compared to other skin care products, which can be stable for 2-3 years. I ordered a Biossance hydration set with the Copper Peptide Serum from Woot! in the last 2 weeks, and when I checked the batch info on Cosmetic Check, the serum was already over 2 years in age. The other Biossance moisturizer that I purchased was already over 3 years. The production dates, batch codes, expirations dates etc. are a mystery until you buy.