Thank you for your question.
Once opened, the Vitamin C Skin Boost lasts 12 months before it expires. On the back of our products, there is a symbol of a container with a number and letter. The letter is usually "M" for month or "Y" for year. The number tells you how many months/years the product can last. Below is also an image of the product with the symbol circled.
We hope this answers your question, and please let us know if you have any more questions!
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