Yes, and active serums go first. Most keep about two years unopened; once opened, many show a 6M or 12M symbol. Vitamin C turns yellow, then orange or brown, as it oxidises, and retinol weakens with light and air.
General cosmetics guidance for serum, not a brand promise. A date or open-jar symbol printed on your pack always wins.
The batch code is on the bottom of the bottle or on the box. Dropper bottles often carry it only on the box, so keep the box.
Commonly about three months; follow the open-jar symbol, and stop once it turns orange or brown.
Yes, but it is more stable than vitamin C: typically 6 to 12 months after opening, as its open-jar symbol says.
Somewhere cool and dark, with the cap closed. Heat and light speed up the breakdown of vitamin C and retinol.
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