The unopened shelf life label of MAC lipstick shows 3 years. However, once opened, it is recommended to use it within 12 months to ensure the quality and taste of lipstick. If the color of lipstick darkens or the texture changes, it means that it has expired and can no longer be used.
The storage environment of lipstick will also affect its shelf life, so sun exposure or high temperature and humidity should be avoided. Lipstick is best placed in a cool and dry place, and try to avoid contact with moisture and air.