Yes, slowly. Unopened shampoo and conditioner usually keep about three years from production; once opened, most bottles show a 12M or 18M open-jar (PAO) symbol. Few shampoos print an expiry date, so the batch code is often the only way to tell how old a bottle is.
General cosmetics guidance for shampoo, not a brand promise. A date or open-jar symbol printed on your pack always wins.
The batch code is printed or embossed on the bottom of the bottle or near the cap: a short mix of letters and numbers. The open-jar symbol with 12M or 18M sits on the back label.
Look for a printed date first, then the open-jar symbol. If there is neither, enter the brand and the batch code from the bottle into the checker on this page: it decodes the production date, and unopened shampoo lasts about three years from that date.
Usually not dangerous, but preservatives weaken with age, so an old opened bottle can grow bacteria or irritate the scalp. If it smells off, throw it out.
Yes, on the same timescale as shampoo: about three years unopened and 12 to 18 months after opening.
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