Quick-Reference FAQ
What is the Cosmetic Batch Code Checker?
A free, instant-access web tool by COSR.AI that decodes cosmetic batch codes to reveal manufacturing dates, unopened shelf life, PAO timelines, and calculated expiry windows—helping users prioritize safety, efficacy, and sustainability in their beauty routines.
How to use the Cosmetic Batch Code Checker?
Select your brand → enter the batch code (found on packaging) → click “Check Freshness.” Results appear instantly: production date, shelf life estimate, PAO guidance, and expiry status—all without downloads or sign-ups.
Where do I find the batch code?
Look on the bottom of bottles/jars, crimped tube ends, side panels, or outer cartons. It’s typically 3–8 characters—letters and numbers only—never barcodes, SKUs, or lot numbers with slashes or hyphens.
How accurate is the expiry calculation?
COSR.AI uses verified manufacturer patterns, regulatory guidelines (EU, FDA, MHLW), and machine-learned validation across thousands of batches. Accuracy exceeds 92% for major brands; minor variances may occur due to internal coding updates—we flag low-confidence results transparently.
What if my brand isn’t supported?
We’re constantly expanding our database. Submit missing brands or unrecognized codes via our feedback form—and we’ll prioritize them in the next weekly update.
How long do cosmetics last before and after opening?
Unopened: Typically 2–5 years depending on formulation (e.g., oils degrade faster than powders). Opened: Guided by the PAO symbol (e.g., “12M” = 12 months post-opening). Water-based products like mascaras expire fastest—often within 3–6 months.
Is it ever safe to use expired cosmetics?
Rarely. Even if appearance or scent hasn’t changed, preservative systems weaken over time—increasing risk of microbial growth, oxidation, and pH shifts. For eye-area or acne-prone skin products, expiration is non-negotiable.
How does COSR.AI handle Japanese cosmetics?
Many Japanese brands encode manufacture dates using year-month-day formats (e.g., “240512” = May 12, 2024) or proprietary letter-number hybrids. COSR.AI includes Japan-specific parsing logic and cross-references JAS/MLHW guidelines—especially critical for products sold internationally without printed expiry labels.