The shelf life of facial base makeup products depends on the product type, formulation system, and storage conditions; generally, it is categorized into two scenarios: before opening and after opening.
When unopened, liquid or cream-based base makeup products-such as liquid foundations, cushion foundations, and cream foundations-typically have a shelf life of 2 to 3 years. This represents their stable period under normal conditions involving protection from light, room temperature storage, and airtight sealing. Powder-based products-such as pressed powders and loose powders-tend to have a longer shelf life, often reaching 3 to 5 years, due to their extremely low moisture content, which inhibits microbial growth.
Once opened and put into use, products come into contact with air, hands, or application tools, thereby increasing the risk of contamination; consequently, their shelf life is significantly shortened. It is generally recommended that liquid base makeup products be consumed within 6 to 12 months of opening, while powder-based products may remain usable for 12 to 24 months, though this still depends on usage frequency and storage conditions. Discontinue use immediately if the product exhibits signs of separation, an unusual odor, discoloration, or a change in texture.
Key factors influencing shelf life include the efficacy of the preservative system, the airtightness of the packaging, the frequency of exposure to air, and the stability of the storage environment (specifically, avoiding high temperatures, humidity, and direct sunlight). Overall, proper usage and correct storage practices are fundamental to extending the safe usability of facial base makeup products.