The question of shelf life came up earlier in the thread so I steeled myself for a call to Neutrogena's customer service number and was, of course, connected to a script reader in the Philippines who was very difficult to understand (me being an English speaker and all). She advised me the law does not require an experation date on cosmetics but she initially said, 3-4 months up to 36 months from date of manufacture. This is determined from the lot number. The Costco purchase I made was produced in April so she decided it was good through April 2024. Considering the ingredients, I suspect the shelf life is, potentially, far longer and, at worst, it could lose some effectiveness (but I doubt it). Considering how many of us buy vintage cologne and shaving soaps like Old Spice, for instance, I'm not too troubled by their off the cuff answer. So long as it doesn't smell off, I'm good.