Thank you for contacting StriVectin. We apologize for the confusion! Our regular (2oz) size SD Advanced! PLUS Intensive Moisturizing Concentrate is packaged with a foil seal under the cap, however, our larger (4 oz) size is not. If you'd like to provide me with the lot/batch code printed on the side of your products tube, I'm happy to translate it's manufacture date for you!
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