Generally speaking, the shelf life of unopened lipstick is around 2 to 3 years, depending on the labeling on the product packaging.
2. Lipstick after opening may have a shortened shelf life due to exposure to air and lip bacteria. It is recommended to use it within 1 year to maintain optimal effectiveness and safety.
3. If lipstick has an odor, discoloration, dryness, or mold, regardless of whether it has exceeded its shelf life, it should be immediately stopped from use, as these signs indicate that the lipstick has deteriorated and may have adverse effects on the skin.