Table of Contents Introduction Unopened Expiration Dates Post-Opening Period (PAO) General Guidelines by Product Type Tips for Extending Shelf Life Frequently Asked Questions (Q&A) Related Links (For Further Reading) 1. Introduction Knowing when to toss your beloved beauty products can be confusing. A clear overview of cosmetic expiration dates for unopened products and recommended usage periods after opening—often indicated by the Period After Opening (PAO) symbol —helps ensure product efficacy and prevents potential skin irritations. 2. Unopened Expiration Dates Most unopened cosmetic products have a shelf life of approximately 2 to 3 years from the date of manufacture. Some sources indicate a general guideline of 30 months. While many products might still be usable beyond this timeframe, manufacturers typically guarantee the quality and texture within this period. Keep a...