[Product Question] C20 OST Vitamin C Serum on Wishtrend, manufactured date is 06/2015, should I still buy?

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Hey, I read somewhere that Vitamin C Serum should be bought/ or used within 3 months of its manufactured date. Can someone please clarify? Since the current manufactured date on the wishtrend website only says 06/2015, should I bother buying it? Thanks! http://www.wishtrend.com/skin-care/502-vitamin-c20-serum-ost.html
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Submitted by teachingprogram